jumped from 15 to 20psi, and 4th and 5th gear got a lot more responsive. 3rd gear didn't get as much stronger as they did. empty up a hill gives about 600*, don't know when i'll be towing.<br><br>all in all, it really helped the lower rpms (where you would expect). the 21 housing would not show any boost in normal around town driving. i get 3-4psi most of the time now

 

 

I have a 16/2 housing wateing for my 4' downpipe before I put it on.

 

I mite need more fuel now okie, the little bit of smoke it'd thro after the pump bump is gone now again with the added boost :P