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What i'd like to know is how much HP gain with pipes but WITHOUT the head work. After all, if the gains are much less w/o the head work than $900 might not be worth it. And i'm sure the head work would jack the cost way up.
Hi, Its best we get the curves up on our site for a proper inspection which will be done asap before final conclusions are drawn. We`d do a Thunderbike head prep for around $400US and yes it does make a considerable differenc to the package.
I`ll post a link as soon as we can upload the charts.
Cheers
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