Im seriously considering returning my car to stock to do some baseline dyno runs. My only performance mods are CAI, tune, high flow cats, Mac prochamber and Mac axel backs. My question is should I return the exhaust back to stock, a good afternoon under the car, or just return the intake and tune back to stock. How much HP could I have gained out the exhaust? From what Ive read on here, only a few HP from axel backs, but maybe what about the prochamber and hi flow cats.

 

I would think if you want some good baseline runs, then yes return to bone stock. But that is me. The exhaust numbers would be noticeable on the dyno.

 

Ugh... why not rent or borrow a stock 'Stang and save yourself all that trouble...

 

Ive just seen to much variation in the numbers from different cars, shops and even types of dynos.

 

Only way to know what your car will do is to go back to 100% stock. So how bad do you really want to know?

 

...and why do you want to know? Not being critical - just curious.

 

Definitely. On the same dyno and same day, I've seen stock S197's put down 247 - 263 rwhp.

 

Yes, just curious. Just don't know if I want to spend two afternoons pulling the exhaust out and putting it back in. But I already have to get under it to fix some exhaust leaks and move the tips forward since they are knocking against the brackets. Argh!!! decisions, decisions.

 

what else do you have to do

 

As far as what? If your asking about what exhaust work. I would have to replace everything from the manifolds back except the over axel pipes. As it sits right now, I should be able to just pull the prochamber off, straighten out the flanges and install new clamps. If I had a lift it wouldn't be as bad. But doing this in the driveway is a royal PITA. Taking it back to stock would give me a chance to get some new videos and sound clips to compare to what I have now.