Making A Cat Back?

[ace ventura]

I'm going to have my local shop make a cat back. What size pipe should I use? I don't think anyone around here does mandrel bends so it will be crush bent. I don't want to lose low end torque if possible. I will probably go with a magnaflow muffler. I also am not sure about single or dual. Performance for towing is my goal. I have the 5.3l and undesirable gearing for towing (3.42). Headers might be an option too.

[TylerMoore]

I'm going to have my local shop make a cat back. What size pipe should I use? I don't think anyone around here does mandrel bends so it will be crush bent. I don't want to lose low end torque if possible. I will probably go with a magnaflow muffler. I also am not sure about single or dual. Performance for towing is my goal. I have the 5.3l and undesirable gearing for towing (3.42). Headers might be an option too.

 

i have a 5.3 with a flowmaster muffler the pipe going is is 3in so i imaginge if you are going to make it your self i would go 3in from cat back.

[Zembonez]

Most here use 3 inch inlets and 2.5 inch outlets (if using dual outlets that is) Otherwise, 3 inch all the way on a single outlet system seems to work fine.

[iminaquagmire]

^^^^^What he said. Unless you've got a built race engine, chances are you're never going to notice the difference between a mandrel bend and a crush bend. If they use a crinkle bend I'd object but otherwise a crush bend will still be fine. If you still want a mandrel system, universal bends can be had cheap enough from Summit, Jegs, or eBay.

[2000DV4.8]

I agree, 3" in, dual 2.5" out if you go duals, keep it 3" all the way if you're going single.

[ace ventura]

Thanks for the reply's. 3" single 2.5" outlets for duals. Got it!

[certifiedcustom]

I agree, 3" in, dual 2.5" out if you go duals, keep it 3" all the way if you're going single.

 

 

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