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The information I got from SLP is if you are running there performance pkge.
Which has there porting , milled head(old head) ,y-pipe mod, airbox mod and there re-flash .
Do not use the new head from the upgrade kit, but use the new double ring pistons only.
The new head will not perform well with there porting , compression is not matched to there porting.
I'm running the slp performance pkge and my 800 Dragon is aready done this way
Running the new dbl. ringers in the original milled head.
I hope they gave me the correct information.
I was told the new head will work great for all turbo's though.