anybody here done this?? i did a couple searches and came up with nill. anywas im gonna try my own porting and polishin. i planed on doing this to the heads, but ill do it the lower collector also. any feedback would be great, or ideas. thanks!

 

I tried it on just the lower collector and it did very little.

By itself, it wasn't worth the time. If you do the heads too, it may have more value.

 

no big gains..oh well. did you notice better throttle response or anything? yeah i hope to do the heads and increase the valves 1mm..with cams. thanks alot tho!

 

No. I didn't drive it. I just dynod it on Rickdoggs Z.

 

k thanks alot for the info. jus trying to help the motor b reath better. got the spacer and intake. going with a new exhaust setup. and when the access port comes out for the g/z ima pick that up.