So driving home last night I decided that the exhaust the previous owner did on my STR was just to loud and drone for my liking. Today after sleeping in due to a long weekend I headed up to the exhaust shop to get it sorted out.

The exhaust how I received it had the resonators removed, twin Borla turbo IIs mounted at the rear with the stock 2.25" piping retained. It sounded awesome just to loud for a jag and droned at highway speed. Also the tips hung a little low maybe 3" from the top of the exhaust openings in the rear valance. Things like that drive me nuts LOL.

SO I had them add two 4" round magnapack resonators, do an X-pipe before the new resonators and unfortunately they didn't have the magnaflow high flow cats in stock so I ordered them and will go back new week to have them installed.

The maganflows with the borla sounds great! Still has that rumble at idle and sounds mean at full tilt but at normal cruise nice and mellow and no drone, thank god! The tips are now up where they belong and oddly it seams to come on boost quicker? Maybe I had lost to much back pressure before? We will see if it makes any change on the dyno once the cats are in.

Only took one pic right after the resonators went in but here they are. I will get some of the back once the rain stops.

 

Yes that should sound a lot better. I think mine sounds great the only thing I did was high flow cats, to free up some power and just give it a little gurgle after all it is a Jag.

 

Might want to look at your sig again qikcat. You must of had some hellaious heat soak putting down 238whp. My Mercury with 305 crank HP got more then that at the wheels. LOL.

 

LOL I hate sigs anyway I have to edit it. Just get a lot of the same pms that will be covered with the sig, thanks!

 

Very similar to the setup I should be putting in this week. Way to go!

 

You will really like it. I am almost affraid the high flows will change the sound, it's perfect now. Looking forward to see if the HF cats make any diff on the dyno, I need to dyno it with the X pipe now to see what that did if anything. In the past an X pipe has made the most improvment in power.

 

Nice set up qwikcat. Enjoy.

 

Looks bad ***! I might also go with the resonators now because the sound is awesome but on the highway its not droning a lot, its just a bit too loud for me, so anyhow, did you stick with the stock piping at 2.25" all way and what part# was that 4" round magnapack resonators you used?

Thanks,

 

Yes stuck with the 2.25 to keep the TQ up. I used the 4" magnaflow 14" magnapack #10445 put it just slightly further back then the stock resonators and did a 2.25" X pipe right in front of them. The x should make more power then what I had, we shall see.

I really love the sound it was just to loud before. The borlas can be raspy when unrestricted.

 

I agree 100% with you on keeping the 2.25" pipe size like I have also to keep the TQ up instead of the going the larger piping route like most due to 2.5". The way I have my setup at the moment is; Hi-flow CATS--->X-pipe----->Magnaflow Mufflers---->4"tips. I"m just hoping if I do get those 4" Magnapack resonators installed it will quieter her down more , but since you said noted you heard the difference, I'll take your word for it

Take it easy.

 

some more pics...

 

qwikcat, that's my 03 silver STR! Give it back! I'm sticking with 2.5" pipe cause she's runnin a 3 lb pulley and having the blower rebuilt and ported. Let's see some dyno's to see 2.25" vs 2.50" pipe. I initially wanted to go with the stock 2.25 piping but slipped into the dark side of power. I'm pleased with the results but must know what's best. Going to another dyno operator after blower rebuild/port, one who'll give me the results on the spot, unlike first dyno op. Good thread dudes.

 

I don't think you will need the 2.50 but we will see. I plan to run the 3# as well as a port also, might take the blower off in a month or two. I have run 40psi of boost on a turbo through 3" so I dont think the 2.25 will be to small but time will tell and since we will have two to compare with both pipes it should be a good test.

 

very nice

 

The 2009-2011 naturally aspirated and blown 5 litre jags run 2.5" pipe.

 

Chevy also runs 2.5 on the 6cyl trailblazer We will see if it's a restriction, and if it is I swap out to bigger. I am just guessing from past projects it won't be. Hey it would not be the first thing I had to redo because I was wrong

 

10-4 on that bro. I'm going to brag...my exhaust configuration changed three times before the present set up, and I only had the car for a year. As previously mentioned, looking forward to 2.25" vs 2.50" pipe dyno comparison.

 

Also getting ready to do the STR. Put the hiflow cats on the 01 jag and it made a nice difference. Anything wrong with the stock resonators? Going with 2.25" pipe, x pipe stock resonators and trying to figure out a way to do the dynomax vt muffler. But the 2.25" version only comes in center outlet.

 

You can put get the VT in 2.50 or 3" and put it on a 2.25 system they just swag the pipes into the larger muffler. The VT is what I would have picked if it didn't already have the borlas. That should be a nice system.

The stock resonators are more restrictive then these. Kind of the same as high flow cats vs stock, I don't how restrictive the stock one is just that these are free flow designed.

Bfsgross, you on let's see how they stack up in the end. Loser gets to buy new pipe LOL

 

LOL! You're on qwikcat. My ride won't qaulify for a 2.5" pipe dyno due to other mods but yas that are stock are fair game.