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Good advice on all the above... And yes, the stock cats are very restrictive with a 600 cell internals, whereas the HF ones are only 200 cell, so you can see the difference in flow. Trying to push all that exhaust through 600 little "straws" vs 200 bigger "straws" opens it up a lot for flow, and sound.
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TSP STAGE 3 CAM,231/246 @112 LSA 614/641 LIFT, CIRCLE D 5C-4200-4500 CONVERTER,LOD INTAKE.CORSA EXHAUST. DSS 1 PC DS. PEGASUS SOLID CRADLE MOUNTS. 486RWHP/475RWTQ.LOTS MORE.
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