2 1/2 or 3 inch exhaust???

Submitted: Tuesday, Jun 18, 2002 at 00:00
ThreadID: 1324 Views:2370 Replies:3 FollowUps:0
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Its time to replace the exhaust on my 80 series turbo-ed 1HZ. I'm thinking a 2 1/2 or 3 inch free flow system. Problem is there is no-one in my town that can/will do a 3 inch at a reasonable price. One specialist strongly reccommends only a 2 1/2 inch which he will make up and fit (incl muffler- free flow, and flex joint) for $380 made from 2mm wall pipe - not 1.6mm. Will a three inch system perform that much better than a 2 1/2 inch? If I go 3 inch, I will have to travel 3hrs round trip and pay nearly $900. But forget about the cost, is the 2 1/2 just as good??? Would I notice the extra performance (if any) from a 3 inch? I currently have the standard size pipe - I think its 2 inch with a baffled muffer.
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Reply By: Goran - Wednesday, Jun 19, 2002 at 00:00

Wednesday, Jun 19, 2002 at 00:00
Tony , 2 1/2 in is more than enough for you motor . Just make sure the flat spot in the tail pipe is by passed with the new system .
AnswerID: 4308

Reply By: colin - Thursday, Jun 20, 2002 at 00:00

Thursday, Jun 20, 2002 at 00:00
Hi Tony, dont fit the free flow muffler unless you like heaps of noise in the cab, i fitted a ford v8 stainless muffler which does the job well. Col.
AnswerID: 4334

Reply By: Yonnee - Wednesday, Jun 26, 2002 at 00:00

Wednesday, Jun 26, 2002 at 00:00
Normally with turbo motors, the bigger the exhaust, the less back pressure, the more power (to a certain extent).
Ask whether your local guy can do mandrel bends. If so, a 2.5" mandrel bent system will flow almost as good as a
normally bent 3". (the normal bends kink the pipe) Also look at the difference between mild and stainless steel.
The stainless system will never need replacing due to rust, however in severe off-roading, landing on a rock can damage
the pipe leading to another expensive repair as not all places can weld stainless.
AnswerID: 4426

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