R6 exhaust help

[biggeeman]

Hi bike is a 2006 r6 not long purchased
I have a racefit slip on exhaust with stock headers and the cat and a pc3 question is..
Is the slip on pointless with the cat still being there or is there still gains to be had.
This I'm sure is the first bike I've had with a separate cat box.
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lol your funny

[TUG]

The cat will cause restrictions in flow, but the slip on will also effect the acustics which are a big part on gaining horses. If you've got a pc3 on there I'd be temped to get a header set without the cat then get it set up on a dyno.
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Haz ER-5, innit!

[biggeeman]

Ok cheers but in the mean time should I return the pc3 back to a stock map. someone at the track told me my bike was running lean due to white exhaust internals?
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lol your funny