Anyone runs aftermarket header with stock catback?
 

I’ve revert my car back to 100% stock except my ACE header and flex fuel kit. I’ve scheduled to remove those next week. But while driving home from the shop yesterday I kind of the sound of ACE header with the stock catback. Has anyone run aftermarket headers with stock catback? Just curious.

I remember it being a commonly suggested combo if you wanted a quiet system but an aftermarket header.

Since you like it, why not keep it?

yep i run ace and flex with the rest stock

Does removing second cat give some power/response?

Some. Especially if it's only cat removed. But biggest gains come from catless header+tune, as cat placement in stock header for it to heat up to working temps sooner makes it also more negatively affecting performance. Once one already upgraded header & tune, more gains start to hit diminished returns. Also often many leave 2nd header for emissions purpose instead of going fully catless.

I did my custom tuning while having the catless header plus flex fuel kit and aftermarket catback. Now the catback is back to stock do I need a tune revision?

Also somewhat unrelated, if i remove the flex fuel kit altogether l while keeping the aftermarket header do I need a tune revision?

Hey guys with ACE header and stock exhaust...mind posting some video clips for sound?

@CSG Mike

He is turbo now, but pretty sure he ran ace with stock catback.

The sound of an ACE header with stock catback is nothing special, sounds really close to stock and is almost as quiet as well. I got a little bit more sound with the CSG Touring 86 Competition catback but again, it is not a sophisticated sound.

Ofh e85 stock exhaust. Sounds like stock to me. Thank God because road noise is loud enough by itself. Last thing I need is drone.

So it’s perfectly normal to run stock catback with aftermarket header and tunes. That’s great, now my car feels like a sleeper, sounds like stock 86 but has ace header and flex fuel tune.

+1 It's fine and probably the best power/volume ratio out there.

Question is do I need to have to do a tune revision when I switch back onto stock catback while still running ACE header and flex fuel kit?

Not needed.