I've got the spacer and an intake and I didn't feel a difference. The sound is a bit louder, but that's about it. Little bolt-on mods don't really do much for our cars. You might wanna just save your money.

 

yea if it isnt gonna be like a oh wow i can feel it then i dont need to throw away 200 bucks.

 

I know it's less of a diff for the AT coupes but if you're doing future mods such as
full exhaust/HFC/tune then the 5/16 spacer will come into play.
But even then you're not going to be getting any real serious hp/tq increase unless u go FI.
It's all about personal preference.
I told myself I wasn't going to mod my coupe at all, that lasted for 1.5 yrs.
After all the mods I've done over the past 3 yrs I've gained minimal hp/tq,
but half the fun is hunting for the parts, seeing how they accent your ride and meeting new G35 enthusiasts.
Just my 2 cents

 

here is my input bro.. I got a 5/16 spacer and a R2C cold air intake.. i dyno b4 and after the install.. I gained a total of 11 rwhp, my torque did pull a lot higher and my A/F went up to 12.. if i recall correctly. It does make the car sound a hell of a lot better and ya "butt" dyno will feel the diff when u take it off the traction control.. over all u will get a small about of gains.. I have an AT 07. My only problem now is that the TB will get a lot dirtier than it did b4.. which requires cleaning..I told the tech at the racing shop that it's burning more gas and he said cuz u are hitting the gas a lot harder now to here the "sound on the intake".. so i agree with him.. cuz that's what i was doing , but now my car is idling higher.. and burning more gas , but i guess that's due to the TB needs to be cleaned

 

this is one of the best breather mods you can do IMO. hi flo cats or test pipes would be the other... and heres some info for ya to check out

https://g35driver.com/forums/engine-...um-spacer.html