ZZP will give you $50 for your old cat.
Matt I am running SDs with the stock flex pipe and the only exhaust leaks I have is where I attempted to weld a cat into the downpipe.
Headers, new plugs, wires, fuel filter, open cone. Then tranny pan drop n fluid change with shift kit. No need for gauges then and will make car feel much better response wise.
Then save some more and gauge if dropping pulley to monitor KR and also tune! Want crazy throttle response(?), port TB or get a North*, but has to be tuned in. Those are simplest and most cost effective things I would do.
$200 and no leaks here! they may have smaller primaries but seriously, whos running over 350 whp here?yeah a lot of people hate on them becasue the almighty sd headers only cost 200 bucks but they arent all that great i think. most have problems with the flex pipe and they have exhaust leaks
yes then get a double walled flex pipe and a o2 extension for sd headers