2.5 in vs. 3 in downpipe

[WooshSI]

I've got a 2.5 inch exhaust. T3/T40E turbo. I'm not sure whether to get a 3 inch dp or a 2.5.
I'm assuming a 3 inch for better air flow but aren't sure if going from a 3in dp to a 2.5 exhaust has any benefits or loss? Looking for some opinions on this. Thanks.

Nick

[iLLeFFeKt CiViC]

if your exhaust is 2.5" keep the downpipe the same size. going with a bigger downpipe could cause some boost creep.

[WooshSI]

Thanks for your help.

Nick

[Supacharge]

you need a 3'' dp and 3'' exhaust. 2.5'' just isnt enough for turbo anymore.

ive seen it done, and works well w/ 2.5'', but you cant beat the 3-4'' dp and exhaust

[iLLeFFeKt CiViC]

Originally Posted by Supacharge

you need a 3'' dp and 3'' exhaust. 2.5'' just isnt enough for turbo anymore.

says who?

[Eq]

Originally Posted by iLLeFFeKt CiViC

says who?

X2... boost creep is prevelent in higher diameter ex/dp piping.

[bonestock94]

3" dp to e-cutout FTW!

[mustangeater]

Originally Posted by Eq

X2... boost creep is prevelent in higher diameter ex/dp piping.

I have 3" d/p with 2.5" u/p and 2.5" exhaust and i dont get any boost creep and im making 10lbs. boost