Quote:
Originally Posted by ALMN
Nope trust me on this. I am a professional engineer in manufacturing. An x pipe is not going to give you any horsepower unless you remove the remaining constraints in the exhaust system. Main constraints are the primary and secondary cats. I am not sure the restrictions on the airfoil suitcase mufflers. The stock system already has an x pipe so going with just an aftermarket x pipe and leaving the remaining exhaust system the same will net you $800+ out of your pocket with 0 horsepower gains.
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Which I believe was done to my car.
My dyno showed an ~85 hp gain at the crank with the mods I have. Sadly though I don't have a baseline, but most of these cars baseline between 390-400 with a few outliers. So I assumed my car baselined for 400 which nets me about 59 rwhp gain which accounts for a 15% parasitic loss.
The only way to come up with 85 hp gain over stock at the crank is if you use the following numbers which I came up with through a lot of research and modesty to down play those numbers to be more reasonable.
25hp from headers
30hp from E85
1-9hp from CAI
7-12 hp from X-Pipe
Add them together you get my exact expected gains. 76 hp at the wheels. Add 15% to that and you get 87.4 at the crank. Obviously some margin of error but we are talking about
: 2.75% margin of error. And I chose to assume my car baselined at 400 rwhp, if that 76 at the wheels is correct, then that means my car baselined closer to 383 at the wheels. Or you are right and the X-Pipe does nothing, and my car then would have baselined at 400. Which is more likely?
Either way, its very hard to come up with an 85 hp gain to the crank if the X-Pipe does nothing. My dyno showed an approximate crank power of 540 hp. Or if you use the formula 545hp.
I did all the number crunching before I did my mods, and I got the near exact numbers I was looking for.