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2.5" vs 3.0" on an I6 

 

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 Post subject: 2.5" vs 3.0" on an I6
Posted: Tue Sep 02, 2008 11:09 pm 
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What yous reckon the 3.0" is too much for the I6? I used to have one on an EB and it sounded like it had some serious grunt, almost like I imagine the V8 would sound like - it did give it a noticable increase in power and am contemplating upgrading the 2.5" on my EF to a 3.0"... what do yous all think?

Would a 3.0" provide a bigger increase in power over a 2.5"?

 

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Posted: Tue Sep 02, 2008 11:15 pm 
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sounded like and actualy had grunt are two very different things.


it's too big.

 

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Posted: Tue Sep 02, 2008 11:18 pm 
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If its turbo go for it, if it n/a stick with the 2 1/2.

 

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Posted: Tue Sep 02, 2008 11:19 pm 
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on an n/a motor u might see a power increase at like 5000-5500
but by that time u are changing gears.
u loose all your low-mid end. 2.5 is the way to go on an n/a.
thats my 2 cents anyway.

 

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Posted: Tue Sep 02, 2008 11:29 pm 
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ive got a full 3 inch exhuast on mine and i lost no low or mid power, but again i didnt notice any gains up high either

 

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Posted: Tue Sep 02, 2008 11:43 pm 
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Cheers guys! Gonna stick with the 2.5" 8-)

 

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Posted: Tue Sep 02, 2008 11:56 pm 
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you would need high end cam, headwork and bottom end work to worry about 3 inch on 4 litres of motor.

grech you would loose bottom end torque, you may not have noticed it though with a t-5 manual pushing 3.7's, as that gearing is quite short and close together.

put a 3 inch on an auto with regular ratio and you will definately feel the engine struggling to push the denser cooler gas out a 3 inch at low rpm.

just remember-

2.25- mild na engine
2.5- warm na engine
3 inch- manic na/turbo engine

 

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Posted: Wed Sep 03, 2008 12:30 am 
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2.25" press bent is a std exhaust.
2.5" press bent is a std XR6 exhaust.

Dont see much point at all buying a 2.25" mandrel bent, as itd flow very similar to a stock XR6 exhaust.

 

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