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the cat is a 'factory blockage'.

I think I've said before that a hiflow cat is actually an oxymoron.

No cat has a Hiflow, they are ALL crap flow compared to a peice of pipe.

R31 Chick,

I'm always good for a laugh even if my car isn't.

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When I come in on monday and we fit the front+dump pipe and then dyno it we should look at the original dyno graph with its boost and a/f ratio and see how rich it was running. BTW: steve I got the hurricane filter from works auto as well and thats on, so that should help the AFM read better as you said.

I found out I'm not to blame for being an idiot self tuner.

The problem (knock/ping) seems to be a single piston issue. We suspect a blocked injector or two. The afr's are super rich as I have previously dialed in more fuel to cushion any potential damage.

The result was a ping at about 4700rpm that prevented us reving it any higher.power: 230 rwhp - afr : high 9 with very little timing advance

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