is there any point in running 3" exhaust from my bell 2.5" dp?
 

If its already bottle necked there, will the 3" from the dp back help at all? I know bigger is better in this respect, but its not going to get any better with this dp...right?

I'm looking at the 3" enthuza w/cat.

i thought the bell dps were 2.75" but anyway it can't hurt, only reason not to go 3" would be for noise, but with a proper muffler and a resonator should be decently quiet

64mm i.d.

pipe size is measured by OD...

and go with the 3". less back pressure downstream is still good.

If Enthuza's 3" fits without banging into anything and isn't too loud for you, they I agree with Y8S, 3" instead of 2.5" post turbo should give you a hp or two.

do it!

3" is the hotness....2.5" is so 2003.

so a 2.5" ID is a what OD?

about 2.75 I think.

But yeah 3" is the only way to go if you're turbo, not much louder than 2.5" and it's just so hot and gives you some more horses

its done. Now I just have to pick up my $350 torsen swap, then decide if I need the 57mm rad or not...then there is nothing I need to buy.

clearly

Has anyone dyno'd a car swapping a 3" for 2.5"? I just got my 2.5" and it looks huge for our tiny motors. Just wondering if the gain is proven or theory.

Not only do I drive a Miata, now I have to feel even less manly with my little 2.5" exhaust.

oh... so i guess i have 2.5" ID Turbo Back

FM, BEGi, and their supporters have always said it doesn't make any difference, but BEGi's new DP is a 2.75".... it probably isn't necessary on little turbos like the Greddy turbo and the gt2554r, but any bigger, and I'd run a 3".