is there a hp diffrence with tailpipes vs. turndowns

[srv1]

Originally posted by Chris_H
Nixon, I am running 2.5" all the way back from the headers, whic are shorty 1 5/8". The turndowns would also be 2.5" inch right out of the back of the muffler. I would be keeping the off road h-pipe, and the mufflers, just adding dumps right in front of the differential. I just didn't think taking 2.5 feet of pipe off would make a difference like that. And I definately have traction issues right now on the street due to crappy tires and 4.10's.
Chris

I have the same setup as him, but with tails. now i can tell you this. I went from my stock headers to my Mac unequal shorties. I lost alot of low end torque. didnt even feel like the same car. But what happened was i started to get more top end power from 4500 and up. Basically it moved my powerband. It used to pull hard from 3500 and up, now its at 4500 and up(roughly). so unless your car has a race motor, stick with a full exhaust. I have ran my car with an open exhaust before(no mufflers). it felt like a dog and had no power until 5500 which was a very small difference.

Smaller for the street/strip. high compression or forced induction i would stick with 2.5 to 3". Turbos are different.

Open exhaust IMOP, is only good for high RPM motors. If you engine isnt designed for it then i doubt you would gain from it. I didnt......