stock exhaust size?

[sacline]

Just wondering what the stock exhaust size is for a 90 tsi fwd. My cat is clogged and want to put a test pipe in place. Thanks

 

[RadDsm]

2.25"

 

[jpmxrider489]

This would be a good time to do a catback.

 

[sacline]

Thanks.. also would a clogged cat put excessive pressure back in the motor? I have. Alot of blow by in the vc..i replaced the pcv and oil cap and didnt help any

 

[007jimmy]

Thanks.. also would a clogged cat put excessive pressure back in the motor? I have. Alot of blow by in the vc..i replaced the pcv and oil cap and didnt help any

Alot of blow by is caused by worn rings or a sub-par crankcase ventilation system.

 

[sacline]

Im sure my rings are ok being i dont burn oil... how do i check cc ventalation system?