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Originally Posted by 2K3_Boxster_S
Lets go back to Post #1, I clearly stated what the setup would be (see below).
Now you are talking about putting brand new stock CATS back on for a fair test.
Why would I want to purposely restrict the exhaust flow? The facts were presented Bolt on aftermarket exhaust (headers w/high flow cats, bypass pipes, and performance exhaust) and you stated it would not yield any gains or possibly have a negative outcome. essentially a waste of money. Thats all I care to find out does it or does it not improve HP and Torque. as far as the AFR the stock ECU will not be touched or chipped in anyway. I will try and keep the variables as close as possible. Same dyno, straps, engine temps, IAT's, etc. No i'm not going to monitor the AFR. This is a simple bolt on test.
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OK, let's see if we can make this simple. I can't speak for Jake, as I am sure he has tried combinations that we have not even seen; but I can say that adding headers and an aftermarket exhaust show little, if any, gains on the dyno unless remapping of the DME is involved. Even after remapping, on the examples we have been involved with showed what I would describe as "modest" improvements, but not spectacular jumps. At the end of the day, the owners spent a lot of money, obtained slight improvement, and often ended up with incredibly loud cars...................... Again, Jake may have additional data points that we do not; but my intuition tells me he has probably seen the same thing.