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I have been advised that I have a blocked catalytic converter and because of this I see that I have several options.
Car is an 1985 L series tourer running a standard JDM-EA82turbo with a 2'' mild steel system all the way, has a few dents and a bit of corrosion.
Options:
1 Remove cat and replace with new one or just straight through pipe.
2 Use this chance to renew entire system in mild steel
3 As above but in stainless

Have been quoted 350 for turbo back including labour for a mild steel system without a cat. Any idea what difference in price I am looking at for the same in stainless? Are the benefits worth the cost? I don't have money to burn but I have spent plenty of time and money on the car and don't see myself quitting it in the next few years.

how positive wuld u be and who told u the cat is blocked?

i wuld think that if its blocked then when u try n rev ur engine it will act liek an exhaust brake that trucks have and immediately bring the revs back down

i say take cat off and bash otu the insides then put it back (makes the cops think u still ahve oen)

Reputable subaru mechanic advised so.
Not sure but I think a 1985 year old car and early don't need a cat, did 1985 L series have catalytic converter? If not then I wont need to avoid cop attention.

hmmm not sure how the law about cat converters wuld work on a 1985 (maybe if it was built 84 but lol)

if u were to get a new system id go 2.5 inch stainless steel tubo back (not that i no wt the difference is between mild steel etc) as 2.5 inch is wat "SubaFury" runs and isnt that a good size for them

Well, got a 2.5" system in mild steel.
After a tune-up it is running sweet, nice and quiet in the cabin with a nice throb on throttle but quiet enough to be not noticeable on the highway, more torque throughout the rev range.

how much boost are you running? or how stock is the setup?

you dont need a cat, mine is 85 and i have a 3" turbo back system with a waste gate Dump pipe and a 3" turbo muffler, straight through i believe, not loud when cruising but u give it the berries and it pipes up

cost dunno but my system works great and sounds good as well (also get a Flex joint at the bottom of the dump pipe, definatly a good idea