High-Flow Cats Discussion - HFC

Jordo!

If you can get away with it/live with it, TP's are one of the BEST bang for the buck mods, A set off ebay will do the job (you will need one or two sets of defoulers -- ideally at a 90* angle -- for secondary O2's or a tune)

I recommend resonated ones as the unresonated ones will be extremely raspy.

Whether N/A or FI, they will net gains.

Now if you can't get away with it for various reasons, go with (resonated) HFC's.

If you have the $$$, N/A or S/C, LTH would be my recommendation for maximum gains, although if you need a cat in there, you'll have to get creative.

I would look into defoulers or a tune... if the secondary O2's are the cause, that SES is related to the degree of delay between primary and secondary voltage readings, interpreted as due to the presence or absence of a functioning cat. When the voltage readings are too close together in time, that implies failed or missing cat and eventually trips the SES. The defoulers are intended to slow down exhaust gas from reaching the 2ndary O2 too quickly.

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