Possibly, i cannot be sure...yet.
Other things are obviously the ported heads with larger valves, the port matched lower manifold, the camshaft specs and the engine oil cooler.
I've never known much about the stock exhausts on these, but maybe there was a difference there.
I'd say a difference in the ECU aswell.
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STREETBUILT RACING
'99 XHII XR8, 363w, GT4508R on 16psi, E85, C4, 910rwhp - ET coming soon!
'78 XC Falcon 500, Desert Gold, 351w, V2 on 16psi, E85, C4, 9" - 10.15@132mph!
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