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Old 03-07-2009, 07:56 PM
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Redoing pipes. Need opinions??

Hey All.

Ditching the 1 3/4 inch pipes due to small sizing.

Going to run a 3 inch pipe from the header into a 40 series 3 inch in n
out straight thru flowmaster muffler back about 55-60 inches.

Then drop it dwn to a 2.5 inch for about 6 inches, then run it into 4-2 inch pipes at a 90 bend and out n up like a set of zoomies.

Thats 8 inches of exit pipes and only a few inches of pipe @ 2.5 inches.

Think that will flow good enuff? Tnx, HG

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Old 03-07-2009, 08:01 PM
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It should work fine. Smaller tail pipes are acceptable as exhaust gases cool greatly as they travel down the pipe. A smaller tail pipe helps them to exit quicker as less expansion due to the cooler exhaust tempature.
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Old 03-07-2009, 09:31 PM
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It will cause a little back pressure,But not enough to worry about.It won't sound as good as the 3'' coming out.
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Old 03-07-2009, 09:34 PM
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It will work fine.a friend of mine has 3in down to 2.5 on his 69 camaro works just fine.I am going to do the same on my 67 camaro. cole
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Old 03-07-2009, 10:08 PM
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Think if I ran the 2 inchers out, then do a 1 3/4 as they come outta the side of the car n up it will work ok? Hg
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Old 03-08-2009, 10:35 AM
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I would if i could run the 3in as far as i could .and then go to 2 1/4 or 2.5 i think it would be best.IMO. Cole
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Old 03-08-2009, 02:42 PM
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Quote:
Originally Posted by DoubleVision
It should work fine. Smaller tail pipes are acceptable as exhaust gases cool greatly as they travel down the pipe. A smaller tail pipe helps them to exit quicker as less expansion due to the cooler exhaust tempature.
im gonna be runnig 2 1/2 pipe thru 2 1/2 mufflers on my s10 back to the front of the rear axle and then turn them down. i could run them on out the back if i went down to 2 inch pipe from there. do you think that would be far enough to run the 2 1/2 pipe before downsizing?
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Old 03-08-2009, 03:24 PM
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we run pipes that way all the time.2.5 or 3in back as far as we can then down size.due to not enough room at the rearend. to make some bends with the bigger pipes over the rearend sometimes will smash the pipe so its a waste so go as big as you can which tailpipes its usually 2 1/4 or 2 1/2 in .if the room is there. cole
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