Melrose Header install
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Joined: Nov 2007
Posts: 76
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From: Saint Augustine Florida
Melrose Header install
I recently had Melrose jet-coated long tube headers, free flow cats and an X pipe installed on my '07 Z51. NICE power and torque increase. Sounds great with Corsa performance cat back but drone is a moderate highway issue and exhaust backfires and pops during deceleration. Normal??? Any other catback work better? Also noticed engine light came on 500 miles after install. Advice would be well received. Thanks.
Team Owner
Joined: Mar 2001
Posts: 25,889
Likes: 7
From: Virginia Beach
CI 3-5-6-7-8 Veteran
The popping during deceleration is 100% normal.
Drone is very subjective... most people get Corsas because they have the least amount of it. Which Corsa system do you have: toruing, sport, extreme?
You'll need to get the car tuned to make the CEL go away. Your rear O2 sensor is seeing the increased flow through the cats as a malfunction and throws a "catalytic converter inefficiency" code. All your tuner needs to do is turn off the rear O2s in the PCM. But having a full dyno-tune will take advantage of the headers and get you another 10 rwhp or so.
Drone is very subjective... most people get Corsas because they have the least amount of it. Which Corsa system do you have: toruing, sport, extreme?
You'll need to get the car tuned to make the CEL go away. Your rear O2 sensor is seeing the increased flow through the cats as a malfunction and throws a "catalytic converter inefficiency" code. All your tuner needs to do is turn off the rear O2s in the PCM. But having a full dyno-tune will take advantage of the headers and get you another 10 rwhp or so.
Racer
Joined: Jul 2007
Posts: 303
Likes: 1
From: Houston Texas
The popping during deceleration is 100% normal.
Drone is very subjective... most people get Corsas because they have the least amount of it. Which Corsa system do you have: toruing, sport, extreme?
You'll need to get the car tuned to make the CEL go away. Your rear O2 sensor is seeing the increased flow through the cats as a malfunction and throws a "catalytic converter inefficiency" code. All your tuner needs to do is turn off the rear O2s in the PCM. But having a full dyno-tune will take advantage of the headers and get you another 10 rwhp or so.
Drone is very subjective... most people get Corsas because they have the least amount of it. Which Corsa system do you have: toruing, sport, extreme?
You'll need to get the car tuned to make the CEL go away. Your rear O2 sensor is seeing the increased flow through the cats as a malfunction and throws a "catalytic converter inefficiency" code. All your tuner needs to do is turn off the rear O2s in the PCM. But having a full dyno-tune will take advantage of the headers and get you another 10 rwhp or so.
I installed melrose long tube headers, hi flow cats and x pipe and the car ran pretty good with no codes. Week later I installed a callaway honker and the car ran and sounded awesome.
After approx. 80 miles of driving I had a check engine light illuminate and I felt the car loss a little power.
I had the car tuned, and the tuner disable the cags 1-4 shift, the rear O2 sensors turned off, and the car ran a lot better. When I have time I will have it dyno'ed tuned and see what the car is putting down at the wheels.
