Headers and loss of torque

[902066]

When you put headers on a stock 90 ZR1 do you get a feeling of torque loss driving normally (not kicking in secondary's) from off idle thru mid-range? Do I need to change rear end gears to 3:91 to more than make up for torque loss? (4:10 is more gear than I want). Stainless Works headers and Flowmaster cat-back, does x pipe instead of resonator make exhaust a lot louder or just a little? Thanks for opinions

 

[Hib Halverson]

It depends on what calibration the ECM has in it and if the engine still has cats or not.

 

[8388]

Anytime you alter the air intake or exhaust to a large degree, you will notice some changes in the way the engine responses at various rpms. All the same rules that apply to a carburated engine apply to fuel injection. To take full advantage of the extra flow, recalibration of timing/fuel is required.

Going from a resonator to an X pipe will be a bit louder, but an X pipes in the proper location will make more torque.

 

[ßill]

" but an X pipes in the proper location will make more torque."

What is the "proper location" for an X pipe? I'm thinking about a cat-back upgrade. exhaust is currently stock.

 

[8388]

The proper location, is as close to the hottest section of the exhaust as possible, past the cats. I've used a bit of spray paint to help me find that spot.