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Welding a pair of high flow cats into myTopspeed bypass tubes is probably a viable option. I guess I would need fore and aft bungs to accommodate the O2 sensors as well as longer wires for those. Should I forsee any problems with CELs popping up?
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James
2004 986 S
987 air intake TB and plenum, Mantissport 2 litre sump, UDP, Bilstein B6 with H&R lowering spings, re71-rs for track, other stuff. 
https://www.youtube.com/user/12shoes2
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