Ok, here's the deal. I just got my TPI in the mail, am going to swap either a stroked 305 or a built 350 (more likely). I don't have to pass emmissions here in TX. What is the easiest and most cost-effective way to run my exhaust: True duals at the exhaust shop or cat-back system? I was leaning towards the cat-back because if I get headers and Y-pipe, a new cat, then it will just be plug-and-play, and I won't have to . Oh, BTW, since the chassis is a bit different on my convertible, will this affect what kind of exhaust system I can use?

 

Read some of my post on how I did my exhaust. I love mine.

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92 RS 305 TBI 5-speed
...no times yet
it'll do 145 mph though

 

I'm not tested for emissions either. So, I removed the cat. Personally, I'm probably gonna go from headers to a y pipe right through the stock location. I plan to have an intermediate pipe bent to factory specs except that it will be 17" longer on the front end to compensate for the missing cat. I am happy with the sound of my eddlebrock muffler (1 inlet 2 outlets). I'm also just gonna use a new set of stock tail pipes.
I'm going this route because cost is important to me simply because there are other things I want like a set of 3.73 gears.
Plus i like the way the set up sounds and It should flow enough for my application.
Since your planning to go with a built 350 you may benifit from true dual. If you go this route you must install an H pipe (balancer, crossover, X pipe, whatever) in order to maintain overall engine efficiency.

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Black 1989 RS Convertible w/43,000 mi.
Excellent Condition
LO3 305 w/TBI
12 PSI Fuel Pressure
6* Timing Advance
Open Element 14x3 K&N
Hypertech Thermomaster
160 Degree Thermostat
Low Temp Fan Switch
Eddlebrock RPM Muffler
No Cat/No AIR Injection
B&M Stage 2 Shift Kit
17"x9" ATP 5 Spoke Alloys
P 245/45 Goodyear Eagle
HP Ultra Plus Tires
Lakewood Control Arms

Coming Soon:
3.73 Gears
Headmann Headers & Y Pipe
Lakewood Pan Hard Rod
MSD Wires and Coil

 

Headers, Y-pipe, no cat, cat back, there ya go!!

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission with 2.77:1 Rear End

Current Mods: Edelbrock TES 1 5/8" Headers, Hooker Aerochamber Cat-Back System, Performance Resource Chip with 160* Thermostat, Accel Ignition Components, K&N Filters, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET : 14.3 @ 97mph
(corrected for elevation)