Aftermarket Header Question

[George Maz]

Originally Posted by Vette73

Yeah no cats on the OBX....I got my car inspected today and it was only ten bucks...Safety inspection.....You don't need cats...

Good to know. I'll be getting NY inspection soon. I have SW headers, X-pipe, B&B exhaust, Cats deleted ...it all sounds great with some porting and Fidanza flywheel.

[C4Ray]

I like Bob's (WARP 10) exhaust setup the best so far in this thread. Just be forewarned that C4s drone badly if the stock system is altered.

Question: What is the ideal C4 ZR-1 setup Cat-back with the most HP unleashed but NO drone?

[Gunny]

Originally Posted by C4Ray

Question: What is the ideal C4 ZR-1 setup Cat-back with the most HP unleashed but NO drone?

"ideal" is subjective and will probably not be the same to everyone ... and without an exhaustive set of dyno comparisons of the various exhaust combos available all done back to back on the same Z my best guess for the most HP with NO drone is headers -> no cats -> Corsas.

I've tried numerous setups on my Z ... some had a lot of drone, some had minimal drone but only 2 systems had NO drone: OEM and Corsas. I'm currently running a setup very similar to Bob's except that the catback I'm using is a 96 LT4. When Marc had my car for porting/dyno tuning he did back to back dynos with the cutouts open/closed ... the OEM mufflers keep everything quiet w/no drone but with a cost of 15HP at the wheels. With the cutouts fully open the exhaust is LOUD and there's enough drone to make my ears hurt. The Corsas are also very LOUD, especially w/out cats, but I never detected any drone when I ran Corsas, headers, no cats.

[C4Ray]

Originally Posted by Gunny

"ideal" is subjective and will probably not be the same to everyone ... and without an exhaustive set of dyno comparisons of the various exhaust combos available all done back to back on the same Z my best guess for the most HP with NO drone is headers -> no cats -> Corsas. I've tried numerous setups on my Z ... some had a lot of drone, some had minimal drone but only 2 systems had NO drone: OEM and Corsas. I'm currently running a setup very similar to Bob's except that the catback I'm using is a 96 LT4. When Marc had my car for porting/dyno tuning he did back to back dynos with the cutouts open/closed ... the OEM mufflers keep everything quiet w/no drone but with a cost of 15HP at the wheels. With the cutouts fully open the exhaust is LOUD and there's enough drone to make my ears hurt. The Corsas are also very LOUD, especially w/out cats, but I never detected any drone when I ran Corsas, headers, no cats.

Interesting .... Thanks for commenting.

[edram454]

yeah i noticed a difference from my flowmasters unmodified and modified... i have headers, corsa and no cats..... and NO DRONE.. the best.


ed ramos #3028