Originally Posted by
Geo Y-Rock
+1 with the GRP 4 plugs. Better idle reliability. Best engine I've ever run. I'm curious about the .28 for truggy. I'm thinking the .21 is plenty of power and will get better economy. Has anyone run both in their truggy? I've run both the JP 3 and the GRP pipe with my .21. I was lean bogging on top with the JP3. I think the stock pipe is easier to tune.
A buddy of mine runs a .21 in his 8T and believe me he has enough power to stay at the front if his driving would improve LOL. He has even told me that he sees no need in the .28 GRP since his .21 does the job quite well and hes pulling 11+ min run times