2.5 or 3" enxhaust?

[Charged99]

Just curious as to what everyone is running. I have 2.5 right now but 3" looks so good from behind on the cobras. Thought about switching but I Just don't want my car to be excessively loud as it's already pretty damn loud without the cat.. What are your guys thoughts on exhaust size?

 

[GodStang]

You can get different size tips if that is what you care about. If you are not making the power I would not go too big or lose it down low

 

[Mr. Mach-ete]

3

 

[CobraBob]

You can get different size tips if that is what you care about. If you are not making the power I would not go too big or lose it down low.

This! I'd stick with the 2.5.

 

[Deric]

This! I'd stick with the 2.5.

Is there a rough HP number or boost number to gauge which size is needed?

 

[UncleDan]

Unless you are pushing big power, you don't need a 3'' system. 2.5'' is perfect.

 

[97snakebite]

dont go beyond 2.5 . just get some magnaflow 3" tips

 

[GodStang]

2.5" is good enough to 650rwhp according to the exhaust manufactures.

 

[Charged99]

That answers my question haha not pushing nearly 650 so I'll stick with my 2.5.

 

[CobraBob]

Is there a rough HP number or boost number to gauge which size is needed?

I had thought it was around 600rwhp based on some threads from the past, but I would more trust GodStang's '650' number as being correct.

 

[Deric]

So, pushing roughly +700 through 3" and swapping down to a 2.5" just to get Borla Stingers probably isnt a good idea

 

[TAF]

"Rule of Thumb" is 100-125 HP per every inch of exhaust...

So, the 650 # above is quite accurate...

 

[JBird_Cobra]

^^ Inch or half an inch?

 

[TAF]

"Rule of Thumb" is 100-125 HP per every inch of exhaust...

So, the 650 # above is quite accurate...

RWHP...I should have said...not crank...

So dual 2.5" should handle 450-525ish RWHP

& Dual 3" should handle up to 750ish RWHP

 

[GodStang]

I had thought it was around 600rwhp based on some threads from the past, but I would more trust GodStang's '650' number as being correct.

650 is what flowmaster I know says and a few others say for 2.5". I am sure that the power gains going to 3" would still be very small even going up to 700. Now I was hoping to be in the 800s so I went with the 3" all the way.

 

[Sick03Vert]

So, pushing roughly +700 through 3" and swapping down to a 2.5" just to get Borla Stingers probably isnt a good idea

:lol::lol::lol:

 

[GodStang]

So, pushing roughly +700 through 3" and swapping down to a 2.5" just to get Borla Stingers probably isnt a good idea

Two options. Get a 3" kit and just swap to a 3" Stinger muffler or switch to JBA with is 3" stainless and sounds very similar to Stingers.