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Adding merge to Y, what outlet size for what I have planned?

This is a discussion on Adding merge to Y, what outlet size for what I have planned? within the External Engine forums, part of the LSx Technical Help Section category; I've decided to have a shop modify my ORY with flowmaster or similar merge. I have a 3" ORY a ...

  1. #1
    Junior Member RebelExtrm02's Avatar
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    Adding merge to Y, what outlet size for what I have planned?

    I've decided to have a shop modify my ORY with flowmaster or similar merge. I have a 3" ORY a 3" E-Cutout and am putting on a 3" Magnaflow quad tip catback. What outlet size should I have on the merge? I already have a 3" e-cutout. Is it worth it to get a 3" to 4" merge and a 4" cutout then neck down for the catback and sell my 3" e-cutout? If not, should I still get a 4" outlet on the merge and neck down to the 3" cutout I already have or just get a 3" outlet on the merge?

    I'm going for the best/cleanest sound I can get through this catback. Rasp is the enemy and I'm wanting to avoid paying for high flow cats just yet.

  2. #2
    Army Dude robcas47's Avatar
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    Arctic White
    01 TA / 06 Duc 749D

    If you are trying to get rid of the rasp then go with the 3" to 4" merge and a 4" cutout then neck down for the catback.

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