so i have a 05 saab 9-2x auto i have a vf39, sti pinks, walbro pump, k and n panel filter , larger tmic , one step colder plugs,....... trying to have a fun daily driver with more power down low then up high.
my ?? is what is the best route to go to keep it stock looking pass smog easily and quite but give the turbo the flow it needs.

these are the options i been looking into

1. ebay up pipe flex and 3"bell mouth downpipe to a sti mid pipe useing a elite adater or double gasket and prodrive axel back. i am thinking these will be best flow nice sound... will it pass smog..

2.gutted sti up pipe. gutted sti down pipe, pro drive third cat delete sti mid pipe to pro drive axel back . will it pass smog?? is this enough for the turbo...

 

Mad Dad "3 catback very quiet! with a 3" down pipe with a cat, when you need top pass smog just put your stock down pipe on and u will be fine, stick away from the ebay up pipe it will crack on you.

 

if you decide to go gutted D/P i have one i need to get rid of this week...

 

Good Luck

 

STi up pipes do not have cats and you can also go with an STi axel back.