Originally Posted by catscan4free
Hello, does a tail pipe make a difference having one or not? I know its louder without one, but does it make a difference in performance? I think I should replace mine, but is there a special way to make it in bends or length
Are we to assume this has a V8 conversion in it?
Tail pipes simply ending under the bed tend to put fumes into the cab. The bad stuff is carbon monoxide, it's odorless, colorless and when present your blood will take it in preference to oxygen, in small doses it makes you grouchy, in larger doses sleepy and tired, in bigger doses it kills you. The amount builds over time, so that breathing a little for a long while results in the level in the blood going up till you pass out and die the same outcome as if you breathed a lot for a short time.
Pipes that end ahead or behind the rear tire, exiting from the side dump into a disturbed air stream that without test could be applying a ram pressure against the exhaust which reduces power out put or in another way of looking at it requires more throttle and fuel for the power you're getting.
The tail pipe out the back under the tail gate is dumping into a low pressure area that always forms when the vehicle is moving. This helps pull the exhaust out of the pipe, whether that action pays for the losses of additional pipe length and bends, I just don't know, I've never tested it. But I assume that the suction on the pipe ends at least equals the restrictions from the added length and turns.
If your's is a V8 conversion, I don't know anybody that makes over the counter pipes for these. Of those I've built I either went to a full service muffler shop that can custom bend tube and have them make a system or I take a bunch of pre-bent tubing 45s and 90s with some straight pipe and weld up pipes from individual pieces. for S10/15 models with the fuel tank under the forward bed on the drivers side, I bring the drivers side pipe just behind the cab and ahead of the tank, make a 90 turn angled up another 90 turn to clear the top of the movement range of the driveshaft. Another 90 to turn aft and parallel to the pipe from the passenger side. I weld a pair of mufflers to a fabricated bracket that picks up the OEM muffler mount on the passenger side. Turn the drivers side exhaust on a 45 with a straight section over the axle then drop it with a 90 and another 90 to turn parallel to the ground and come out the left rear under valence or bumper. The passenger side pipe goes over the rear end and uses a pair of 90s to get parallel to the ground and come out the right side of the valance or bumper. For a 305 or 350 I come off the headers with 2-1/2 tube. If it has cats they take 2-1/2 in and out but I reduce on the out end to 2-1/4 and run that size to the rear pipe exits. For 383s and 400s I increase these sizes to 2-3/4 or 3 inch up front and 2-1/2 to 2-3/4 out back.