BORNGEARHEAD said:
In my years of car repair, i've never heard of any car (mustang or import) getting 30 hp from muffler and intake. If, and only if, you pulled your cats and collectors off, then maybe an intake and exhaust (minus cats and collectors) could net you 30 hp at the flywheel. Stillen is lying if they say just an exhaust is netting 20hp at the wheels. I promise. [/B]
What about the Maxima? I had a 95 Max Se and with cold air intake and b-pipe it was supposed to get big gains. And with the Cattman y-pipe, hello. For sure big gains. I can't imagine what the gains are on the new Maxima and Altima.[/QUOTE]
I'd have to agree with this. 30HP is unrealistic unless maybe the car has forced induction to start with. On a turbo car, and 15HP gain is possible depending on how restrictive the stocker was.
The number one NA HP gain on the Spec V is going to be a header with no cat.
Race shops are out ot make money and I don't belive a lot of the dyno's I see. Not that the dyno's are fake, but it's takes a number of parts put togeather to get added HP. No exhaust for the spec V is going to free up 25HP. No way in Hell. If you have a intake, header w/out cat, main high flow cat, no resenator, and a free flowing muffler, or a cat back, you might see 25-30HP over a 100% stock car. If you have been around long enough, you would know that getting rid of stock cats, and mufflers alone are going to free up power, not the larger exhaust. At least not for a na 2.5l
Or you might get a little gain on top, but the low end loss would be lousy.