bweiler

I took the JP-4 off my CEN to put on my v-spec in my new D8, when I noticed the header was covered with dents. In motocross, dents in the header killed performance. Is this a problem with RC engines?

j_blaze

not enough for us noobs to notice, just need to freeze the pipe full of water and it will pop back.

FoamyVictim

Make sure to seal both ends with a cork or something, otherwise you're wasting your time.

bweiler

I called my LHS and he said most 21 headers are the same and he might not have the Jammin but could sell me something else. Does this sound like it makes sense?

FoamyVictim

It could change the way the pipe works, as in change the power range. It "could" work for OR against you.

djzachtyler

My Feedback: (4)

most headers are very similar, unless using a high performance pipe, you just want to make sure the diameters are the same, and that it is a close match to the one you are currently using.

generally you will see them fully curved or in some applications more squared. just make sure it matches what you are using...

Of course it is probably best to just have your LHS order the direct replacement to be on the safe side...