I have the Greddy Evo catback and getting the OBX/SSAutochrome/NextGen headers. Which one do I need?

Magnaflow Universal Hi Flow Cat (http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2457957659&category=33636)


I plan on purchasing this week, so any info would help!

Thanks

I dont know the specs of the exhaust system you have but what ever it is is the size you need. Probably 2.5". Thats what I got. If you have the exhaust you should know what size it is and if you dont Im sure you can find it. Hope this helps.