99 4.2 & cats
#1
#2
#5
Originally Posted by phil6608
Just put 1 high flow cat on each side. And put your 02 sensors back as close to were they were as you can.
You will be amazed at the difference!
Phil
You will be amazed at the difference!
Phil
#6
Hey I have a 07 4.2 litre v6 and I cut my cats out on my truck there's 2 cats towards the back and it has 2 resinators/collectors up towards the exhaust manifolds. If u do end up cuttin out the cats you can buy spark plug fowlers from your local parts store they work as a spacer for the o2 sensors so it just reads enough exhaust gas to keep the check engine lights off!