3" Fujita cai, obx 4-1 race header + udp, borla 2.5" header back exhaust fully catless, bsd, vtcs delete using an exedy stage 2 clutch (3 puck) with fidanza 8.5lb flywheel in my D23 mazda3...power band has definitely shifted up a little bit. I'd go with something a tad heavier for NA but I don't think it's a big compromise. Great for a highway car. I have FI plans so it'll work out fine in the long run, been running this setup for a year now thoug, no tune. I have some 17x9 245/40 summer tires stuffed under the fenders and 3 88D mounts...the puck clutch lets you launch the thing like a bat out of hell if you slip it a tiny bit. The clutch bites hard, I wouldn't have it any other way. The price difference between stage 1 and 2 wasn't much where I bought my clutch and flywheel from.