High Flow Cat recommendations

[454Suburban]

Was looking for some feed back on a high flow cat for my 91 suburban. I got a .040 over 454 long tube headers and going into a single 3" exhaust. Any info, experience would be appreciated.

 

[big_mike]

I just got a set of 2.5" Thunderbolt high flow cats for my dual set up. Only paid $100 for a set shipped. Reviews are good on them so I figured why not try them out. Won't have mine done till after we get back from Disney World for my daughters big cheer competition, so no feedback other than they look very well made.

 

[Big D]

I have had good luck with Magnaflow and Walker.

However, seeing you have headers, I would upgrade to a 3 wire 02 sensor(heated) 1st, I melted my catalytic converter not long after the headers were installed, as my truck was not getting in a closed loop fast enough.