bottom line is you get what you pay for...1st off,lets forget about ur tranny for a sec...i had a ram 900 series clutch set up,about 150 normal street miles, no abuse really, SI street suck...car made a few dyno passes. clutch lasted one rental,1st pass was leaving around 35-4000, second was a full blown pass leaving at 5500, that clutch let go,came about in about 5 pieces...came to the conclusion after that,goin fast in a straight line = C4 all day unless you feel like doing clutches after each season with is gonna get $$$$ for the clutch and especially with you have to pay someone to wrench...ive always had a blower car,10 times better with the C4,i just dont use my left foot,lol.and no need to drop the trans after each season,best thing ive done. even thou out of about 5 ppl i know that had that clutch,i was the only one that it fail the durability test...g force trannies are over rated,they break the same-have a story for that as well...id stick with the TKO 600,i liked it when i had it, havent heard ne one bitch bout it...if ur interested in a C4,lemme me know,have a few ppl that that would be able to help you out at dynamic..just trying to help someone out bfore they spend money like i did bfore doing what i should have done in the 1st place,but was thickheaded...my o2..