STOP!! Read This Before You Remove Your Center Muffler.
Senior Member
Joined: Jul 2014
Posts: 454
Likes: 55
From: Barrington Rhode Island
Mina has a sale on the rear muffler delete pipes for $299. Removing just the center muffler increases sound just a tad if thats what you are looking for. Id reccomend an H or X in place. Removal of the rear mufflers will wake it up a bit more than that. For me I liked that the Mina kit gives you some nice looking tips/finishers to boot. For that $299 it's a steal in my opinion and looks much better than factory. If you find it to loud you can alway have some high flow mufflers installed and still have the new tips and pipes of the mina kit
Veteran Member
Joined: Apr 2014
Posts: 1,245
Likes: 174
From: NYC
Well after all I've read I'm torn between Mina rear muffler delete or mid small mufflers and better pipes,no squish, from first muffler/ factory H pipe and rear mufflers.
I was going to spend the money on the Mina air intake but I'm thinking a new filter and remove silencer mod is the way to go. Heard K&N clogs stuff with its oil,not good if true.
I was going to spend the money on the Mina air intake but I'm thinking a new filter and remove silencer mod is the way to go. Heard K&N clogs stuff with its oil,not good if true.
You can also get high flow non oiled filters. I have a speed sensor issue in my trans that I will be hopefully taking care of this weekend along with new valve sleeves in the TB. If I can get that taken care of I will be working on an intake for my XKR which includes the Mina Air filter kit. Why? For the price they are going for now its a good base to start with IMO. My XKR has exhaust an dmy xjr has air filter mods. Dont know what I like better...That loud blower whine or exhaust!...My xKR will have both soon!
Veteran Member
Joined: Apr 2014
Posts: 1,245
Likes: 174
From: NYC
Same tips I have. I can tell you one thing for sure. If you remove both the rear mufflers and center it gets LOUD. That show mine is now. But I think the rear delete was a smart move and the price certainly right.Its amazing how the engineers that design exhausts do thier job..really
Senior Member
Joined: Jul 2014
Posts: 454
Likes: 55
From: Barrington Rhode Island
You can also get high flow non oiled filters. I have a speed sensor issue in my trans that I will be hopefully taking care of this weekend along with new valve sleeves in the TB. If I can get that taken care of I will be working on an intake for my XKR which includes the Mina Air filter kit. Why? For the price they are going for now its a good base to start with IMO. My XKR has exhaust an dmy xjr has air filter mods. Dont know what I like better...That loud blower whine or exhaust!...My xKR will have both soon!
The Mina delete and a high flow in the stock box with the silencer disconnected.
Now if I could find some that could reprogram the trans I would put posi 3:55 rear gears. I just love driving the damn thing.
So you never answered. Are the Mina deletes much louder?
Senior Member
Joined: Jul 2014
Posts: 454
Likes: 55
From: Barrington Rhode Island
You can also get high flow non oiled filters. I have a speed sensor issue in my trans that I will be hopefully taking care of this weekend along with new valve sleeves in the TB. If I can get that taken care of I will be working on an intake for my XKR which includes the Mina Air filter kit. Why? For the price they are going for now its a good base to start with IMO. My XKR has exhaust an dmy xjr has air filter mods. Dont know what I like better...That loud blower whine or exhaust!...My xKR will have both soon!
Veteran Member
Joined: Mar 2008
Posts: 1,698
Likes: 285
From: Boston Mass
High flow non oiled? Who's ? I think that's it for mods to performance.
The Mina delete and a high flow in the stock box with the silencer disconnected.
Now if I could find some that could reprogram the trans I would put posi 3:55 rear gears. I just love driving the damn thing.
So you never answered. Are the Mina deletes much louder?
The Mina delete and a high flow in the stock box with the silencer disconnected.
Now if I could find some that could reprogram the trans I would put posi 3:55 rear gears. I just love driving the damn thing.
So you never answered. Are the Mina deletes much louder?
Veteran Member
Joined: Apr 2014
Posts: 1,245
Likes: 174
From: NYC
The combination of rear muffler delete and center muffler delete is loud. People love the sound actually. Me I think its a bit to loud for my taste. I posted a video somewhere. At idle its pretty quiet. When you rev in neutral it will pop a little but driving it just screams with no pops or backfires. I believe amsoil was one company that had non oiled high flow filters but they are discontinued...May still have some. There are a few others if you search around as well
Senior Member
Joined: Jul 2014
Posts: 454
Likes: 55
From: Barrington Rhode Island
How did you over come the transmission throwing codes problem. On the XK8 with the six speed if you change the gears or even tire size the trans doesn't know when to shift because it's linked to wheel speed.
Senior Member
Joined: Feb 2014
Posts: 219
Likes: 32
From: Shreveport, LA
Good points
Before I get to the exhaust, Ill explain where most of us are missing stock power.
1. Premium octane fuel is not being used,the knock sensors will detect this and retard timing.
2.Old oxygen sensors are metering air, but very slowly.The computer compensates and this robs a ton of power and creates bad gas mileage.
3.You have a fuel filter under the car, no one has ever bothered to change,this takes away power in the mid and upper where you need it most.
4.You have spark plug galleries full of oil,the oil will heat up and create vapors of oily liquid, that will cause misfires.
5.MIS-ADJUSTMENT OF THE THROTTLE CABLE. Most are adjusting to remove slack WRONG,adjust until you can barely tap the gas pedal and the engine revs up immediately.
6.Tire pressures are set to the factory 26psi. This creates a drag! Try riding your bike with low tire pressure and see how hard you have to work to get going and stay going. 35-40psi is where its at,also consider rolling resistance tires.
7.You have a worn engine that needs to be replaced or you buying a new car.If your engine is ticking knocking any noise thats internal beside the timing tensioners, its time for another car,unless you are full pledged in keeping the one you have.
Now the exhaust
The factory exhaust was tuned to make immediate power from idle to the mid range, in conjunction with transmission shift points. The 4.0 is a small displacement high revving engine with DOHC heads.
The drone comes from the exhaust turbulence.
To combat the drone, the exhaust must be equally balanced,meaning if you cut something off, something of similar restriction must be applied to maintain the proper power to noise balance to a point where you gain performance without too much noise.
2. Since the engine is exhaling better, it needs to inhale better. Simply remove the air silencer off the factory airbox and install a K & N air filter.
3. The pipes almost crush flat over the rear axle is the most restrictive point of the exhaust.
4.It's a gain worth every penny you spend. With me personally seeing a XK8 pull 309 HP and 318 Ft lbs of torque without the tune at the engine in proper running shape.
1. Premium octane fuel is not being used,the knock sensors will detect this and retard timing.
2.Old oxygen sensors are metering air, but very slowly.The computer compensates and this robs a ton of power and creates bad gas mileage.
3.You have a fuel filter under the car, no one has ever bothered to change,this takes away power in the mid and upper where you need it most.
4.You have spark plug galleries full of oil,the oil will heat up and create vapors of oily liquid, that will cause misfires.
5.MIS-ADJUSTMENT OF THE THROTTLE CABLE. Most are adjusting to remove slack WRONG,adjust until you can barely tap the gas pedal and the engine revs up immediately.
6.Tire pressures are set to the factory 26psi. This creates a drag! Try riding your bike with low tire pressure and see how hard you have to work to get going and stay going. 35-40psi is where its at,also consider rolling resistance tires.
7.You have a worn engine that needs to be replaced or you buying a new car.If your engine is ticking knocking any noise thats internal beside the timing tensioners, its time for another car,unless you are full pledged in keeping the one you have.
Now the exhaust
The factory exhaust was tuned to make immediate power from idle to the mid range, in conjunction with transmission shift points. The 4.0 is a small displacement high revving engine with DOHC heads.
The drone comes from the exhaust turbulence.
To combat the drone, the exhaust must be equally balanced,meaning if you cut something off, something of similar restriction must be applied to maintain the proper power to noise balance to a point where you gain performance without too much noise.
2. Since the engine is exhaling better, it needs to inhale better. Simply remove the air silencer off the factory airbox and install a K & N air filter.
3. The pipes almost crush flat over the rear axle is the most restrictive point of the exhaust.
4.It's a gain worth every penny you spend. With me personally seeing a XK8 pull 309 HP and 318 Ft lbs of torque without the tune at the engine in proper running shape.
Veteran Member
Joined: Mar 2008
Posts: 1,698
Likes: 285
From: Boston Mass
I have the Mercedes 5 speed transmission so we reprogrammed the TCM.
Member
Joined: May 2015
Posts: 79
Likes: 6
From: Aiken, SC
To clarify final and existing(?) setup: H (or X) pipe, removed front (common, single) muffler, removed intermediate mufflers (at rear axle), and OEM rear muffler and tips, YES? That means you have only OEM rear mufflers and tips. Can that be correct? Are you still satisfied with sound and overall performance?
Thanks for clarification.
EHT
03 XJR (4.0 S/C) with 6% S/C pulley.
Thanks for clarification.
EHT
03 XJR (4.0 S/C) with 6% S/C pulley.
Senior Member
Joined: Apr 2014
Posts: 732
Likes: 128
From: LI NY
Installed a K&N filter on my '99. Set reduced power off within first 50 miles. Scan gauge, clear, all good. Placed 100's of miles since without light resurface. The filter must be doing something right. PS, installed K&N filter after I reinstalled factory air box. Had " fresh " air system installed. Sounded good. Problem was I could not get enough cool air to intake to be worth while. I noticed on hot days air intake temps excessively high. Rich
Veteran Member
Joined: Apr 2014
Posts: 1,245
Likes: 174
From: NYC
To clarify final and existing(?) setup: H (or X) pipe, removed front (common, single) muffler, removed intermediate mufflers (at rear axle), and OEM rear muffler and tips, YES? That means you have only OEM rear mufflers and tips. Can that be correct? Are you still satisfied with sound and overall performance?
Thanks for clarification.
EHT
03 XJR (4.0 S/C) with 6% S/C pulley.
Thanks for clarification.
EHT
03 XJR (4.0 S/C) with 6% S/C pulley.
i have ave only a dynomax ultraflow x muffler which is two in and two out with the 4 rearresonators deleted.
Member
Joined: Jun 2018
Posts: 86
Likes: 13
From: Mesa, AZ
I purchased a 2004 Jaguar XKR in 2018 and the previous owner installed the Mina under axle exhaust system. I love it. Nice sound, doesn’t have that wrap sound when you back off, and not real loud in the car. The Mina system eliminates the two small mufflers, after the center muffler, and they claim their system adds 17 bhp.
Veteran Member
Joined: Apr 2014
Posts: 1,245
Likes: 174
From: NYC
I purchased a 2004 Jaguar XKR in 2018 and the previous owner installed the Mina under axle exhaust system. I love it. Nice sound, doesn’t have that wrap sound when you back off, and not real loud in the car. The Mina system eliminates the two small mufflers, after the center muffler, and they claim their system adds 17 bhp.