Guy building my 4mil recommended snipers then CPI/sheares. Gary offered tuning help once my pipes arrived Those pipes will work with those porting specs and any engine combination you build later up to 125 horsepower. Most people don’t put any coating on the pipes. They just WD40 and steel wool after cleaning, cheap glass cleaner works to stop rust too. Yeah, the 4 mill will be a better fit. They should work well on any big engine you build later with a std flange, Super Cubs and Cheetahs. Some builders use the std pipe on gas engines making 125, most of the feedback is with the 521 Super Cub. I was quoted 450 to chrome the pipes out of arizona. I am not a fan of chrome. I’ll leave raw. But don’t want to deal with rust AT ALL ant any point. I live in dry desert. Might be fine. I’m thinking about using the beoshield t-9 I think I LED uses it Claude nice vid Basically what I’m doing 4mil 35’s Vf4 Pod filters Snipers Pro mod. What clutch were you using? Lockout? Slingshot? As of now I have a driveline clutch, HD springs, billet basket, straight gears. Sent from my iPhone using Tapatalk