the monster gt's pipe wont work, it wont send enough pressure back to the tank and you'll lean out and die. i tried my savage pipe on my mt2, and it went like a bat out of hell for about 30 seconds then it leans out and dies. just get a .12- .18 low end tuned pipe it'll be enough. but you won't be able to control the 18 TZ 's power with two wheel drive unless you are a phenomonal driver.and you need a different manifold than the rs4's engine. trust me. i have the rs4 mt2 with the 18 tz in it.