I have a 08 G37s coupe with 45k miles. I am currently making 304 whp. The power mods I have are z1 cold air intake, z1 HFC, z1 intake plenum, hks exhaust,uprev tune and stillen headers. I am strongly thinking about buying the stillen A2A kit but my biggest concern is the 5AT transmission. I asked Soho Motorsports and Z1 and they believe at some point I have to rebuilt the transmission. Do y'all think it's worth throwing all that money and possible headache or just buy a new car. I was thinking about the Q50 sport or red sport.

 

G37 has more character and is a 'sportier' driving car than the Q IMO. Still recommend driving the RS; might be what you're looking for. 5AT will need a rebuild eventually; a transmission cooler will help extend the life. Luckily, unlike the 7AT, the 5AT has a transgo kit you can buy and even install yourself :
https://www.z1motorsports.com/transm...at-p-9755.html

A much more cost effective option compared to the 7AT.

 

Thanks, also forgot to mention this is not my daily I brought the car about three years ago and put 9k on it since.

 

Worth it? That's subjective to the owner. Expect to spend at least $10k, closer to $15k+, to do it RIGHT. The only way I'd drive an auto boosted car if it was a DCT (maybe ZF). CJM is making a BMW DCT trans conversion kit for the VQ motor. The autos suck on the Infiniti's, seen so many break. Even on NA cars. Most tuners will limit torque on boosted setups to prevent them from breaking. If it was 6MT I'd say do a single turbo setup from SOHO, that's my plan.