You can install an aftermarket performance model like the Magnaflow, but you'll be fine with a OEM replacement model. Just make sure it's not one of those cheap made in China models, those are useless. Some states have regulations regarding the Catalytic converters, so it's mostly illegal to sell those older Made in China models anyway.
Just shop around and make sure you're going to a private shop vs a place like Meineke. I recently had a new converter installed on my 95 Suburban (it had a Made in China one from 2 years ago, and it was totally dead). I called about 15 places, I had quotes as high as $400 and as low as $145.
Magnaflow 94009 Oval Catalytic Converter, Magnaflow 94119 Universal Catalytic Converter Oval 3" In/Out w/ Air Tube, Magnaflow 94006D Universal Catalytic Converter Oval 2.5" In/Out, Magnaflow 94234 Universal Catalytic Converter Oval 2" In/Out w/ O2 Port, Magnaflow 94239 Universal Catalytic Converter Oval 3" In/Out w/ O2 Port, Magnaflow 94404 Universal Catalytic Converter Oval 2" In/Out, Magnaflow 94166 Universal Catalytic Converter Oval 2.5" In/Out w/ Dual O2, Magnaflow 94116 Universal Catalytic Converter Oval 2.5" In/Out w/ Air Tube, Magnaflow 95009D Universal Catalytic Converter Oval 3" In/Out, Magnaflow 99165HM Universal Catalytic Converter Oval 2.25" In/Out w/ Dual O2, Magnaflow 37075 Catalytic Converter California CARB OBDI Oval 2.25" In/Out, Magnaflow 94133 Universal Catalytic Converter Oval 1.75" In/Out w/ O2 Port, Magnaflow 94163 Universal Catalytic Converter Oval 1.75" In/Out w/ Dual O2, Magnaflow 94038 Universal Catalytic Converter Oval 2" In/Out w/ O2 Port, Magnaflow 93527 Universal Catalytic Converter Oval 2"/2.5" In/Out w/ Air Tubes, Magnaflow 94264 Universal Catalytic Converter Oval 2" In/Out w/ Dual O2, Magnaflow 94115 Universal Catalytic Converter Oval 2.25" In/Out w/ Air Tube, Magnaflow 99164HM Universal Catalytic Converter Oval 2" In/Out w/ Dual O2, Magnaflow 99075HM Universal Catalytic Converter Oval 2.25" In/Out, Magnaflow 99435HM Universal Catalytic Converter Oval 2.25" In/Out w/ O2 Port, Magnaflow 94309 Universal Catalytic Converter Oval 3" In/Out, Magnaflow 94169 Universal Catalytic Converter Oval 3" In/Out w/ Dual O2, Magnaflow 94409 Universal Catalytic Converter Oval 3" In/Out, Magnaflow 36014 Catalytic Converter California OBDI Oval 2" In/Out w/ Air Tube, Magnaflow 99076HM Universal Catalytic Converter Oval 2.5" In/Out, Magnaflow 95029 Universal Catalytic Converter Oval 3" In/Out w/ Air Tubes, Magnaflow 91064 Universal Catalytic Converter Oval 2" In/Out w/ Dual O2, Magnaflow 91063 Universal Catalytic Converter Oval 1.75" In/Out w/ Dual O2, Magnaflow 94265 Universal Catalytic Converter Oval 2.25" In/Out w/ Dual O2, Magnaflow 94039 Universal Catalytic Converter Oval 3" In/Out w/ O2 Port, Magnaflow 99439HM Universal Catalytic Converter Oval 3" In/Out w/ O2 Port, Magnaflow 45106 Catalytic Converter California CARB OBDII Oval 2.5" In/Out, Magnaflow 45054 Catalytic Converter California OBDII Oval 2" In/Out w/ O2 Port, Magnaflow 94266 Universal Catalytic Converter Oval 2.5" In/Out w/ Dual O2, Magnaflow 94269 Universal Catalytic Converter Oval 3" In/Out w/ Dual O2, Magnaflow 91066 Universal Catalytic Converter Oval 2.5" In/Out w/ Dual O2, Magnaflow 99134HM Universal Catalytic Converter Oval 2" In/Out w/ O2 Port, Magnaflow 99436HM Universal Catalytic Converter Oval 2.5" In/Out w/ O2 Port, Magnaflow 94405 Universal Catalytic Converter Oval 2.25" In/Out, Magnaflow 94215 Universal Catalytic Converter Oval 2.25" In/Out w/ Air Tube, Magnaflow 45109 Weld-On Catalytic Converter California CARB OBDII Oval 3" In/Out, Magnaflow 94205 Universal Catalytic Converter Oval 2.25" In/Out, Magnaflow 94004D Universal Catalytic Converter Oval 2" In/Out, Magnaflow 94204 Universal Catalytic Converter Oval 2" In/Out, Magnaflow 99039HM Universal Catalytic Converter Oval 3" In/Out w/ O2 Port, Magnaflow 94135 Universal Catalytic Converter Oval 2.25" In/Out w/ O2 Port, Magnaflow 99509HM Universal Catalytic Converter Oval 3" In/Out, Magnaflow 94005D Universal Catalytic Converter Oval 2.25" In/Out, Magnaflow 41409 Weld-On Catalytic Converter California CARB OBDII Oval 3" In/Out, Magnaflow 94074 Universal Catalytic Converter Oval 2" In/Out,
