| If you are running the stock T hose, it and your MAF are probably a restriction. I think the JWT dual POP elbows are smaller than 2.5 on one end as well. The pipe that goes under the headlamps is 2.5 The accordian pipe is 2.5 in but I dont know if the accordian section makes it turbulent or not. The turbo inlet hardpipe I believe is 2.5 > 2.0 and it has some weird crushed areas to fit around the motor mounts. SZ has a cast alluminum replacement by Mike Smith but I dont know about availability. If you can get one of these it requires a replacement for the accordian pipe as well (search for woody75's [I believe] writeup). From the turbo outlet to the TB's is mostly 2.0 inch stuff. I think Ash's, Tom's, and the Border kit all replace everything from this point to the TB's. The TB's are also < 2.5 inch so if your getting the kit you will want some larger TB's from Z1 or from an old Stanza. Also I think the massives are the only widely used SMIC's with 2.5in inlet and outlet's, although SZ has modified stillin units for 2.5in. I emailed them about welding on new in/outlets for my greddy's and they said it likely wasn't worth it, They reccomend going with the massives. Hope that helps, and I hope most of it is accurate.
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