I purchased a 421 cheetah kit from Trinity Racing about a year ago, with this kit i got 2 sets of pipes, drag pipes and trinity stage 4 pipes. With the drag pipes the quad performs perfect but everytime i try and run it with the stage 4 pipes the quad hardly makes any power (barely pulls top gear) i have tried on many occassions to talk to Trinity i guess get stupid answers like "have you tried moving the needles?"
My question is "does anyone own a 421 cheetah thats is duneable and if so what in-frame pipes do you use?

 

CPI makes a set of inframe drags...I know that will work for ya...I was kinda having the same probs as you..so im just staying with the out of frame drags....

 

who is CPI?

 

Custom Pipes Incorporated

CPIs hit the Keihin PWK carbs on my 535 Cheetah. Tried Shearer big bore inframes ran ok, but they rubbed the cylinder. I once heard that you could buy offset intake manifolds that would allow the pipes to clear the CPIs.

 

Go look on ebay..There are some In frame CPIs on there..

 

Thanks for all the info guys.
On ebay I also found a shop called Grand river racing, who quote they have the best in-frame pipes on the market.
Has anyone tryed these pipes or herd of them.
Thanks.