Need Help

[lightningone]

Heres the deal I bought 2 of the magnaflow 2.50 in/out high flow cats for a great deal. I have done searching and was under the impression that I could cut out all four cats and just replace two of them with these and then stright pipe the other. Well I found a muffler shop to do it but he said I cant do that and bla bla so. can someone explain to me which of the two cats to delete with straight and which two to replace with the high flow. Thanks guys

 

[lightningone]

Can someone give a helping hand :shrug:

 

[MJG]

I did this exact thing on my past set-up. It passes here fine through the sniffer, but visual inspection, well that could be up for discussion.
Either way, yes you can cut out the stock 4 cats, fab in some tube and put the highflows as far back as you can, further from the heat the better.
Worked just fine for me.