5 replies to this topic

[Type X]

Im planning on using 2 1/4 inch piping for my exhaust...

Ive heard from a few people that a 2 1/2 inch bent pipe is a good substitute for a 2 1/4 mandrel bend bc it compensates for the diameter loss in the bend.

Is this true?

[timothymckay]

yeah, ive heard this before. I'm not sure how much difference (if any) the mandrel bends make, yes it would be more efficient, but i doubt it would be noticable.

[AudioCra-Z]

Well, the only problem I can see with this analogy is that you can't measure how much you are actually getting when you crush bend it.

The only thing I can think of is try to keep the pipe as straight as possible, and you will have less restriction.

[shauno]

Yeah, your exhaust is only as big as the smallest section...

With 2 1/2" pipe you will start to have trouble with the clearance over the back axle. Unless you do a sectioning job and tuck it up really tight.

[4dr]

the diameter will get smaller the more extreme angle it is bent.

Crush bends also typicaly sounds like shit. i'd just keep the stock exhaust if your not gonna do it right.

thats just my opinion...many ppl use crush however. its basically a matter of preference.

note: you can buy mandrel bended pipe fairly cheaply if u source it right.

Edited by 4drhseriesEGII, 22 March 2004 - 04:00 AM.

[shadowboy]

the other main problem with crush bends, is that it is not so much that the diameter gets smaller, and you use bigger piping to compensate.

the problem is related to the constant changing of piping diameter. this causes the exhaust gasses to have to accelerate through the crush bend, and then decelerate as the pipe opens up after the bend. nevermind the turbulence in the exhaust this creates.

go with mandrel bends.