Cadillac SRX First Generation Forum - 2004 - 2009 Discussion, SRX V8 performance exhaust stats in Cadillac SRX Forums; Got my 4.6L SRX w/all-wheel about a week and a half ago, and I absolutely love it. I have it ...
Got my 4.6L SRX w/all-wheel about a week and a half ago, and I absolutely love it. I have it in the shop today as I am having a pair of MagnaFlow performance mufflers put on. My question is, has anyone done any post-performance-exhaust testing on their SRX V8? What kind of hp boost will the exhaust add? Perhaps 10%?
Well, I talked to my mechanic about this (he's the owner of the local Midas muffler and brake, and a friend, so I know he's not BSing me), and he said that the Magnaflows add 5-10% horsepower...which also goes along with what the Magnaflow website states.
After the upgrade, it is noticably 'punchier' than before. Also, for anyone concerned about the noise of performance exhaust, it has a really nice, deep low rumble, but is definitely not obnoxiously loud. From both the interior and exterior, you can tell that it is not the stock exhaust, but the quiet ride is still in tact.
Also, another little cool bit of engineering that I was unaware of, but noticed while my SRX was up on the lift is that there is a box that both pipes go into at about the midpoint of the car...not being the most automotive savvy guy, I thought originally that this was a single cat serving both sides of the engine, but as it turns out, there are dual cats up front...this box works to balance the flow of air between the two sides of the engine, which also improves performance over straight pipes. I'm sure there is a name for this box, but I'm not sure what it is...perhaps the more knowledgeable members of the forum can enlighten me. Way to go Cadillac engineers for going the extra mile!
All in all, a very nice upgrade that came in at $311.00. Highly recommended.
I have a 2005 V8 with everything, and have contacted Borla and all of the other major players in the exhaust business, without success. The Magnaflow website shows some nice pictures of muffler shops building custom exhausts for a variety of vehicles, including a Ferrari Testarossa, using all Magnaflow parts, Y-couplings. brackets, etc.
Which specific mufflers (model name and part number) did you use? And which tailpipes did you add? Were you able to use the original hangers, or did you need ones from Magnaflow? I recently sent their technical support an email, and the reply stated that there was no specific application, and they offered no other suggestions.
Well, honestly, unless you're really amped to do a full exhaust system, it isn't necessary to replace anything but the mufflers, and maybe change out the baffle box with an X tube style balancer. All of the pipes are good 2 1/4" diameter from the engine back. Cadillac did a good job of getting the engineering right on the exhaust system.
As for the Magnaflows, I'm actually not sure what kind were used...I asked my mechanic to put on what he felt would be best (since he's in the muffler business and knows much better than I do). I'll get under there tonight to see if I can find a model/part number, and I'll take a picture or two also. As for the tips, I had them slice off and re-use the stock tips because I liked them a lot...I probably would have gone for the circular crome with the rounded end just like the stock ones, so why pay extra cash for 'em? And yes, he was able to reuse the original hangers.
It appears that you have the center/offset ports, and they fabricated an angled connector at the intake. This looks like the model # 12586, 5" x 11" oval, 2.5" ports, specifically for larger displacement engines, seen on the Magnaflow website under "universal mufflers" which would be closest to stock. For all other potential SRX users, it is the size and shape which is the key feature. You can then add any of their various tip types.
Please ask your installer to confirm the part number and/or size, or just measure the length of the muffler body alone. The actual length will not be 9'' or 11", but can be converted to the correct size from the Magnaflow website.
I just received an email from Jim Browning Jr. at Corsa Performance, who indicates that Corsa is in the process of developing an SRX exhaust system, which should be available "in coming months".