Just want to know whats the performance gain from a full exhaust in a 04 mustang gt 4.6l.

Thanks

 

Maybe 15 hp.

 

Do you mean headers, mid-pipe, and mufflers? Certain setups produce more rwhp and others make more torque. On my 04 GT I run Bassani headers and catted X pipe (won't pass smog in Cali even though it's catted), and Borla side-exit exhaust. This setup gave me an extra 40ish horsepower.

 

I take you had it dynoed before and after to see that 40 ish hp gain?

 

40? And I was only at 120 WHP before the supercharger

Realistically, on an otherwise stock car you're only going to get 15 rwhp out of exhaust, most of that coming from removing the cats. Ford did a pretty good job with the exhaust on stock Mustangs.

 

40 extra ponies? i dont think so, even with CAI and tunner will be incredible to believe.

 

Sorry, I must have been having a senior moment; maybe it was after the second 40 oz. 40 hp is a typo; it should be 20ish. I should have looked at my dyno sheets from 4 years ago. My apology.....The average on 3 dyno pulls was 20.17 rwhp gain with my setup. It's all in the headers!!! Not even NASA could get 40 hp out of any exhaust system on our cars.