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Just bought a set of LG Pro Series Longtube Headers with Highflow cats for my 03 with A4. I am wondering how much additional RWHP I should expect. Currently I am generating 310RWHP with the following Mods.
Corsa Tiger Shark Pace Care Catback System
Blackwing cold air intake
Hi-Flow Air Bridge with smooth coupler
Dyno Tune
Blackwing, LG Pros w/ cats, and stock cat-back (tuned by LG) = 340rwhp/354 rwtq. Had 310/326 before.
Now have a GHL Bullet cat-back but have not re-dynoed. LG said a good cat-back would probably be worth 5 hp.