i dont think this is worth the change on your behalf. if you were going for a ported heads/big cam setup i wouldnt go with this one either.

stick with your xp on stock heads, if ported heads with raised lift limits then think about an xpz or an is3. just my opinion though.

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98 XGT - 3.2/3.4, s&s, ported m90/TB/LIM, 1.9s, jp dbl; tinted, blacked out, lowered
soon -> e85, meth, and a lot smaller pulley