2.5" exhaust to big?

D

dmc919

Member

Sep 4, 2006

41

0

6

Jan 20, 2009

#1

• Jan 20, 2009

• #1

running long tube headers and 2.5" duals with an H pipe. no mufflers or cats. im running a 100 shot of Nitrous but i think i went a little to big on the exhaust. this is on a 302 with e7's with the exhuast bump grounded out.

 

2000xp8

SN Certified Technician

Aug 8, 2003

8,024

1,616

194

NJ

Jan 20, 2009

#2

• Jan 20, 2009

• #2

The exhaust size is fine, but you should have some kind of muffler for back pressure.
100% straight pipes makes less power, not more on a mild street car.

 

vristang

15 Year Member

Mar 31, 2005

4,933

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Seattle

Jan 20, 2009

#3

• Jan 20, 2009

• #3

There is nothing good to come from backpressure.

If you want to talk about resonant wavelength tuning, then go ahead and do so. But calling it backpressure is WRONG...

2.5" is NOT too big. Why would you think that?

 

90lxcoupe

20+ Year Stangneter

Oct 7, 2003

3,596

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Jan 20, 2009

#4

• Jan 20, 2009

• #4

2000xp8 said:

The exhaust size is fine, but you should have some kind of muffler for back pressure.
100% straight pipes makes less power, not more on a mild street car.

Click to expand...

agreed, put a nice straight through muffler, like a ultraflow or a magnaflow on it. you will pick up power and tq. and you wont get hassled by johnny law

 

5spd GT

"the 5.0 owns all"

Founding Member

Aug 7, 2002

9,516

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99

Arkansas

Jan 20, 2009

#5

• Jan 20, 2009

• #5

Which form of backpressure are you talking about? The wrong length pipe or a restrictive exhaust system? I believe you are talking about the latter.

It is all bad.

Also, make sure you understand the difference between diameter and area.