Adding mufflers and backpressure

[dzwestwindsor]

Hello, I have a 1971 Chevy C20 with a 350 motor. It has stock manifolds with a 2 inch outlet. I'm assuming all the pipes have a 2 inch diameter. It also has glass pack mufflers.

I'm thinking of swapping out the glass packs for turbo mufflers, because the glass packs are a bit too loud/old and rusted out.

Will switching to turbo mufflers cause too much back pressure to an already small (2 inch) exhaust system?

I'm thinking of getting either the Flowtech Raptors or the Thrush Turbo:
http://www.summitracing.com/parts/bi...0flt/overview/
or
http://www.summitracing.com/parts/wlk-17704/overview/

Any feedback about my situation would be very much appreciated, thanks.

[trac209]

No you'll be fine with that

[TobyArnot]

I had my exhaust plumbed with 2.25" pipe using Thrush turbos. The turbos lasted about 1-1/2 yrs. before starting to rust away and get too loud for my taste. After installing a new GM 350 crate motor, I replaced them with these Dynomax mufflers. sound nice, not too loud and hopefully will last longer.
.
http://www.summitracing.com/parts/wlk-17731/overview/

[Lattimer]

mine is 2.25", but I have the raptor mufflers. They were a little too loud for me so I wound up adding resonators. My pipes exit in front of the rear wheels, so if your go out the back you won't notice as much as I did.

IMHO, 2" is a little small for a 350, but not enough to really hurt sInce you are running stock manifolds.

[WIDESIDE72]

There is much discussion on the web (google it) but Imo 2" dual exhaust is fine with a300- 350 hp engine