To go 2.5" or 3" exhaust??

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caseywan

Member

Apr 7, 2006

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Chicago, IL

Jan 30, 2007

#1

• Jan 30, 2007

• #1

I am doing a motor build this winter and am debating going 2.5" or 3" exhuast.

Motor will be Boss 302 block stroked to 336, very heavily ported TFS heads, heavily ported GT40 lower with Kenne Bell 2.2 Flowzilla pushing 10-12psi, and 3:73 gears.

I'm thinking I am going to have some serious low end torque and am tossing around going 3" exhaust to even it out a little bit.

What do you guys think?

 

rickd93_lx

New Member

Dec 22, 2005

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Jan 30, 2007

#2

• Jan 30, 2007

• #2

for forced air induction, especially at 10 to 12 psi i would recomend a 3 inch exhaust to help clear out spent gasses and allow for a frsher mixture in the cc's.
i would also recomend 1 3/4 inch lt's. back pressure and superchargers do not combine well. more boost does not nessisarally more power the less resistance the super charger has the more power you will produce even @ a lower boost level.

 

8

86bluecobra

Advanced Member

Dec 20, 2004

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B.C. Canada

Jan 30, 2007

#3

• Jan 30, 2007

• #3

i believe 2.5 inch is supposed to be good to around 400 ponies before it starts hampering performance. I have no doubt that combo will exceed that number so go with the 3 inch.

 

f4fntm

New Member

Oct 10, 2004

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Olympia, WA

Jan 31, 2007

#4

• Jan 31, 2007

• #4

what they said ^

 

tom23

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Dec 20, 2004

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CT

Jan 31, 2007

#5

• Jan 31, 2007

• #5

3 in. all the way

 

LB0193

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Dec 6, 2005

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Jan 31, 2007

#6

• Jan 31, 2007

• #6

3inch no q asked

 

Grn92LX

Fidanza Man!

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Jan 14, 2001

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Jan 31, 2007

#7

• Jan 31, 2007

• #7

3"..And fyi, just because you put a "bigger" exhaust on does NOT mean you "lose" low end torque.

 

5.0 Nostalgia

10 Year Member

Feb 28, 2003

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Jan 31, 2007

#8

• Jan 31, 2007

• #8

3" without a doubt. If you don't want longtubes, Bassani makes a 1 3/4" short tube header for Anderson Ford .

 

C

caseywan

Member

Apr 7, 2006

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Chicago, IL

Jan 31, 2007

#9

• Jan 31, 2007

• #9

Ok, guess I will definatly be going longtube, thinking full Bassani with Longtubes and o/r x-pipe.

Thanks for everyones input.