Factory Exhaust Resonator Removal and Free Flowing Alternatives - ZR-1 Net Registry Forums

SteelBlueZR1 · 05-08-2012

How many of you have tried keeping your stock 2.75" factory ZR1 exhaust system and just replacing the 1990-92 restrictive resonator with an aftermarket freer flowing resonator or x pipe?

Haibeck says the stock resonator is a major exhaust flow restriction costing about 20hp, due to the resonator core reducing to 1 5/8” ID.

What is the best product to replace the resonator with to maintain the low noise and no resonance I currently enjoy?

I prefer not to go to a straight pipe or crossover, but rather find a replacement resonator with straight through 2.5-3" pipes. Has anyone tried the DynoMax® Ultra Flo™ X performance stainless steel mufflers with 3-in. diameter internal X-pipe balance tubes?

I am concerned about fitment issues, so what have you tried that fits the factory pipes and doesn't drone?

05-08-2012	#1
SteelBlueZR1 Join Date: Aug 2011 Location: Evergreen, Co. Posts: 346	Factory Exhaust Resonator Removal and Free Flowing Alternatives How many of you have tried keeping your stock 2.75" factory ZR1 exhaust system and just replacing the 1990-92 restrictive resonator with an aftermarket freer flowing resonator or x pipe? Haibeck says the stock resonator is a major exhaust flow restriction costing about 20hp, due to the resonator core reducing to 1 5/8” ID. What is the best product to replace the resonator with to maintain the low noise and no resonance I currently enjoy? I prefer not to go to a straight pipe or crossover, but rather find a replacement resonator with straight through 2.5-3" pipes. Has anyone tried the DynoMax® Ultra Flo™ X performance stainless steel mufflers with 3-in. diameter internal X-pipe balance tubes? I am concerned about fitment issues, so what have you tried that fits the factory pipes and doesn't drone?