[RonCT]

I've read every post I could find through searching and haven't found a definitive answer to my question. Hoping the collective wisdom here can help.

I just purchased a 1985 Euro 3.2 that is tight and strong (1-3% leak-down). PO fitted a Fabspeed 1:2 muffler and Steve Wong chip.

I am backdating the front fenders and bumper and the rear bumper to '73, another Long Hood look.

The car has OEM heat exchangers and cat and now that the car is >25 years old it is exempt from emissions, so the cat can either be replaced with a pre-muffler or removed altogether. The OEM heat exchangers look tired - pretty rusted, so I'm not opposed to replacing them.

If I keep the fabspeed muffler I could cap the passenger side for a more accurate look, but am open to a dual exhaust (both sides, both to the rear).

I want to get the most out of this car and it will be used for street only. So maximum HP at top RPM is less important than low to mid range.

Options as I see them, tempered with advice from some fellow forumites - keep in mind it's a Euro spec engine:

Stick with the OEM exchangers, swap cat for bypass, and keep the Fabspeed with 1 or 2 outlets. This re-uses the Steve Wong chip already on the car. Could also change the muffler for something that might fit / look more correct with a 73 rear bumper.

I have a feeling that if I'm going to replace the exchangers, I might as well also remove the cat and change the muffler for a 2:1 (or 2:2). But would this be a true "exhaust backdate" or do I need something else because it's an 85 but with a 73 rear bumper - or do I need something else because I need an 02 sensor. This could get expensive - replaces everything including the chip. But there is some credit back as the $1,000 Fabspeed muffler probably has some value.

I like the concept of the reduced weight and complexity of buying some new exchangers and a more traditional muffler - and I don't want this too loud. The advice to date is "maximum flow" and a suggestion the B&B 1.75" exchangers would be a good starting point. But then what to put that into...

Thanks in advance,
Ron