He's probably got so many wiring diagrams and stuff that would be useful too though I'm afraid I'd need a few weeks to decipher it all!
..i miss that guy.

 

Ah cool. 2.5" it is. Can't wait for your results this coming week 3" sounds right for your setup. As for my setup I'm sure I'll create a new thread somewhere on some forum detailing my build. I've done some like that in the past and they've been invaluable to return to for tips and tricks I may have forgotten along the way.

Nope, never heard of the flapper valve on newer cars. I like the name you came up with for your "D-flap variable velocity valve". It's quite apt. Yeah let us know how your setup works out.

 

Oh before I forget, I have considered using a q-tec right before the RB muffler in case the muffler actually is a restriction. Then I was given some advise suggesting that a q-tec can become unreliable on something as ferocious as a 20B. But then my setup will be just a simple NA streetport that will be street driven. I feel I can risk it.

Basically I could wire it up to the MS to open at a certain RPM or load and close any other time. I could then run a seperate pipe from the q-tec to exit wherever it's convenient. The point is to take the muffler out of the equation so there is no backpressure. However, velocity will be affected, perhaps negatively so I'm hesitant to give this idea the green light just yet.

 

I've decided against the q-tec for now. Having read what rotarygod wrote in gmonsen's thread sealed the deal. Even though his was set up a bit different from the usual way, I just don't see a reason to use one on my setup, which would be set up in the usual way.

I don't want to sacrifice velocity and run the risk it failing. There is also the potential that noise could emminate from it even when closed. I want to build this system right the first time so I never have to deal with it again.

Simple, reliable components that many have used and they last basically forever. There are enough systems with these parts and they withstand the test of time.

Three thickwall mild steel 2" primaries leading into a correct 30° 2.5" thickwall *collector, then into an RB 2.5" presilencer (probably the T2 unit since I don't need the aux port actuator tube), then up over the rear end and into an '81-'82 Powerpulse main muffler. Oh and a couple flanges here and there to faciliate removal if/when necessary. Of course the pipes will be protected with some sort of coating since they are mild steel.

*I decided that it would be ok to collect directly into a 2.5" pipe rather than into a 2" which would expand to 2.5" because the size difference is fairly small and I don't feel the need. Anyone care to comment? Thanks.

 

Steve says that his RB powerpulse '81-'82 muffler performs like his straight-through 3" RB universal muffler HP-wise. The only difference is a lot of noise. Plus since the ID of the RB muffler inlet pipe is the same ID as the 2.5" thickwall pipe I plan to use, there won't even be a squeeze-down near the end of the system, not that that would be a bad thing as the exhaust gasses do cool and contract that far from the engine, you know.