Sean, I beleive my APT fmic pipe kit is 2.5" polished aluminum. If you get it, get the T-bolts as well. Thanks again for all your input guys. I'm getting the Samco silicone kit next. My budget is somewhat limited to buying one part at a time and I check for best prices vs. best quality and performance. Yes, I do Ebay for some parts. So farso good though.

 

I justinstalled the K&N drop in and I didn't notice a difference. I can now hear the turbos spinning at low RPM though.

 

APR bi-pipe, cast aluminum > silicone