Exhaust Flow: Pipe inlet/outlet

[steaminhotryce]

Hey guys,

I recently got my hands on a GReddy header for the KA. Because I've heard from many people that this particular header tends to crack at the flanges, I bought a Megan N/A downpipe (midpipe) which comes with a flex section to hopefully prevent the GReddy header from cracking. Now here's the question:

GReddy header outlet: 2.75 inchesMegan downpipe inlet/outlet: 2.5 inches/2.5 inchesCatco high flow catalytic converter: 3 inchesBlitz Realize TT Catback: 3 inches

Will having a 2.5-inch inlet/outlet downpipe (midpipe) cause a restriction SIGNIFICANT enough to affect the flow of the exhaust gas?

Thanks! Also, you don't have to tell me how much better the Hotshot header is.

[steaminhotryce]

^^

[mmm240]

i imagine not that significant, but if you are really worried about it get a downpipe that is 2-3/4

you're never going to know the difference unless you test a downpipe with both 2-1/2 and 2-3/4 on your vehicle anyway.