XK / XKR ( X150 ) 2006 - 2014

Exhaust upgrade suggestions

 
  #1  
Old 03-25-2019, 11:54 PM
Senior Member
Thread Starter
Join Date: Mar 2019
Location: Los Angeles
Posts: 108
Received 22 Likes on 15 Posts
Default Exhaust upgrade suggestions

Hi guys, I'm enjoying the heck out of my 2009 XK but I hate the stock exhaust! I've got a wild hair up my rear and will get rid of the stock exhaust. My #1 goal is performance... but I don't want it to be annoying. I am thinking of going with Magna Flow muffler up front and straight pipe all the way to the rear. I am thinking about adding a X pipe just rear of the muffler. Any suggestions? Pro's Con's?
 

Last edited by badicedog; 03-26-2019 at 12:37 AM. Reason: Picture
  #2  
Old 03-26-2019, 12:53 AM
steve_k_xk's Avatar
Veteran Member
Join Date: Jun 2015
Location: Ryde, Australia
Posts: 1,702
Received 463 Likes on 331 Posts
Default

If after performance go 200cell cats + X pipe and a tune to suit
 

Last edited by steve_k_xk; 03-26-2019 at 12:56 AM.
The following users liked this post:
badicedog (03-26-2019)
  #3  
Old 03-26-2019, 12:57 AM
kj07xk's Avatar
Veteran Member
Join Date: Jan 2015
Location: Naperville, Illinois USA
Posts: 3,152
Received 772 Likes on 627 Posts
Default

Read Ranchero50ís build thread.
Good stuff, and his experience with exhaust mods.
 
The following users liked this post:
badicedog (03-26-2019)
  #4  
Old 03-26-2019, 09:55 AM
SLazz's Avatar
Senior Member
Join Date: Feb 2018
Location: Southern California
Posts: 170
Received 37 Likes on 17 Posts
Default

I too am thinking of upgrading the exhaust on my 4.2 N/A convertible. I spoke with Chris at Mina and I will be buying one sometime soon. From what Chris told me it's best to stick with a 2.25" pipe on the aftermarket exhaust. That's the diameter size on the Mina. It'll match the size of the stock pipes which in turn will not have an adverse effect on the car's low end torque.
 
The following users liked this post:
badicedog (03-28-2019)
  #5  
Old 03-26-2019, 09:58 AM
Stuart S's Avatar
Veteran Member
Join Date: Aug 2010
Location: Atlanta suburbs
Posts: 5,274
Received 2,219 Likes on 1,441 Posts
Default

Save your money and trade up to a 4.2L XKR (or 5.0L if your budget allows). An exhaust mod, without more, won't give you a significant performance improvement.
 
The following users liked this post:
Cee Jay (03-26-2019)
  #6  
Old 03-26-2019, 10:16 AM
SLazz's Avatar
Senior Member
Join Date: Feb 2018
Location: Southern California
Posts: 170
Received 37 Likes on 17 Posts
Default

Originally Posted by Stuart S View Post
Save your money and trade up to a 4.2L XKR (or 5.0L if your budget allows). An exhaust mod, without more, won't give you a significant performance improvement.
That's true. The only change in a N/A will be sound. Not performance.
 
  #7  
Old 03-26-2019, 10:58 AM
Senior Member
Thread Starter
Join Date: Mar 2019
Location: Los Angeles
Posts: 108
Received 22 Likes on 15 Posts
Default

thanks for the suggestions guys. I just got the car, so I won't be getting rid of her. She is in pristine condition, I doubt I would find another in the same condition for what I paid. So if all I get is a better sounding CAT, so be it. I can live with it.
 
  #8  
Old 03-26-2019, 11:00 AM
mosesbotbol's Avatar
Veteran Member
Join Date: May 2008
Location: Boston, USA
Posts: 5,309
Received 679 Likes on 586 Posts
Default

I had Magnaflow mufflers swapped for the OEM muffler and it was horrible. The back pressure dropped too low and the car was a dog. Worst money spent. Threw the mufflers in the dumpster and put the old muffler back on.

If you want to change out the exhaust, go for an engineered system. Larini is one of the best, regardless the marque.
 
The following users liked this post:
Queen and Country (03-27-2019)
  #9  
Old 03-26-2019, 11:14 AM
Cee Jay's Avatar
Veteran Member
Join Date: Apr 2013
Location: Kaysville, Utah, US
Posts: 5,419
Received 1,146 Likes on 855 Posts
Default

You DO realize that a capable exhaust system will cost at least a couple grand, right?
 
  #10  
Old 03-26-2019, 11:23 AM
SLazz's Avatar
Senior Member
Join Date: Feb 2018
Location: Southern California
Posts: 170
Received 37 Likes on 17 Posts
Default

Originally Posted by badicedog View Post
thanks for the suggestions guys. I just got the car, so I won't be getting rid of her. She is in pristine condition, I doubt I would find another in the same condition for what I paid. So if all I get is a better sounding CAT, so be it. I can live with it.
I think you'll be just fine with a performance exhaust alone. Money spent on gaining more high end horsepower is kinda of a waste when it comes to driving here in Southern California. Driving in So Cal is mostly launching the car from stop light to stop light on surface streets and bumper to bumper traffic on the freeways. That said, my 4.2 N/A 300 horsepower convertible gets the job done. Just drop the transmission into the Sport Mode and she'll launch like a jet.

Once I move out to Palm Springs then that's another story. Miles of open road begs for an "R" but again. here in So Cal not so much. Enjoy your new ride!
 

Last edited by SLazz; 03-26-2019 at 12:48 PM.
  #11  
Old 03-26-2019, 12:39 PM
kj07xk's Avatar
Veteran Member
Join Date: Jan 2015
Location: Naperville, Illinois USA
Posts: 3,152
Received 772 Likes on 627 Posts
Default

If you can live with just sound improvement on an XK, and not spend a whole lot, find yourself a used back-box from a 2007-2009 XKR. The valves are naturally open without a vacuum supply, so you'll have a better sound, and no worries about drone.
 
  #12  
Old 03-26-2019, 01:28 PM
Senior Member
Join Date: Oct 2014
Location: DC
Posts: 250
Received 51 Likes on 41 Posts
Default

I heard a XK with a modified exhaust and was shocked it sounded amazing.
I could not believe it was a NA 4.2
 
  #13  
Old 03-26-2019, 04:08 PM
steve_k_xk's Avatar
Veteran Member
Join Date: Jun 2015
Location: Ryde, Australia
Posts: 1,702
Received 463 Likes on 331 Posts
Default

Originally Posted by SLazz View Post
That's true. The only change in a N/A will be sound. Not performance.
False statement

X-pipe & free flowing cats will not only increase sound but performance as well
 
  #14  
Old 03-26-2019, 04:21 PM
SLazz's Avatar
Senior Member
Join Date: Feb 2018
Location: Southern California
Posts: 170
Received 37 Likes on 17 Posts
Default

Originally Posted by steve_k_xk View Post
False statement

X-pipe & free flowing cats will not only increase sound but performance as well
A catback exhaust is the only mod I suggested. An X-pipe and free flowing cats are additional mods. So, with just a catback exhaust the only gain is sound. The horsepower gains alone are negligible.
 
  #15  
Old 03-27-2019, 04:45 PM
Senior Member
Thread Starter
Join Date: Mar 2019
Location: Los Angeles
Posts: 108
Received 22 Likes on 15 Posts
Default

I contacted Larini to see if they offered an exhaust for my XK 4.2. They responded promptly and have an awesome system avail. $1100 + shipping for the muffler, 30 days lead time to construct. Club Sports Center section is an additional $600 . They guarantee a noticeable torque feel with a flat torque band across the power curve. I’m sold!

Center section

Sports muffler
 

Last edited by badicedog; 03-27-2019 at 05:22 PM. Reason: wrong price
The following users liked this post:
mosesbotbol (03-27-2019)
  #16  
Old 03-27-2019, 05:48 PM
Senior Member
Thread Starter
Join Date: Mar 2019
Location: Los Angeles
Posts: 108
Received 22 Likes on 15 Posts
  #17  
Old 03-27-2019, 06:02 PM
SLazz's Avatar
Senior Member
Join Date: Feb 2018
Location: Southern California
Posts: 170
Received 37 Likes on 17 Posts
Default

Originally Posted by badicedog View Post
Man that sounds MEAN!!!
 
  #18  
Old 03-27-2019, 06:05 PM
steve_k_xk's Avatar
Veteran Member
Join Date: Jun 2015
Location: Ryde, Australia
Posts: 1,702
Received 463 Likes on 331 Posts
Default

Absolutely love this system and well priced !!
 
  #19  
Old 03-27-2019, 07:04 PM
jagtoes's Avatar
Veteran Member
Join Date: Sep 2013
Location: NY
Posts: 4,660
Received 1,298 Likes on 981 Posts
Default

Sorry but with the echo of the room it wouldn't sell me on buying one. I would need to hear it myself . Just my opinion
 
The following 3 users liked this post by jagtoes:
Queen and Country (03-27-2019), ralphwg (03-28-2019), samuelpyster (04-07-2019)
  #20  
Old 03-27-2019, 07:17 PM
Senior Member
Thread Starter
Join Date: Mar 2019
Location: Los Angeles
Posts: 108
Received 22 Likes on 15 Posts
Default

I agree, but that's not the reason that I'm buying one. Larini has a long established race history. If they are telling me I will see a noticeably increase in torque with a flat torque curve across the power band, I'm sold. The tuned sound is an added bonus in my opinion.
 

Thread Tools
Search this Thread
Quick Reply: Exhaust upgrade suggestions


Advertising
Featured Sponsors
Vendor Directory

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: