What sort of muffler set up seems to sound the best? I'm leaning towards some sort of straight through muffler. I'm not sure what size exhaust is necessary for my mild A12.

Im kind of in the same boat as you. I want to know what is the best for running the GX exhaust manifold (twin) all the way back or?

Large straight through exhausts are good for turbos. On a A12, it'd sound like a buzz box.

Mild A12? I'd think that 2inch system would be as big as you'd want. A hotdog resonator and a good quality offset straight through rear muffler would be what you are looking for.

Getting a brand name muffler is the key. Genie, Walker, Lukey muffler is a good start. Going for some EBAY chinese made stainless job will not work.

Dual pipes from the GX manifold all the way to the rear? This would weigh too much and not give any benefit. You'd be looking at running 2 separate 7/8 inch pipes to keep exhaust velocity up. You wouldn't find appropriately "cool" mufflers.

With the high exhaust volume of a rotary (effectively 2 stroke), it makes sense to run two pipes to the rear, effectively making 2 exhaust systems.

It sometimes seems like a good idea to spend a lot of time thinking about ways to tune exhaust for improvements, but if this "thought time" is at the expense of getting the project finished, then forget about it, and just get on with it.

Exhaust is relatively cheap, and can be creatively modified on weekends if the car is your daily driver.

The other trick is that mild steel will generally give a warmer sounding note, with stainless sounding more 'tinny'. Although the longevity of stainless makes it worthwhile.

Hey BlueMax...what's that VB doing in the picture? That's an Australian standard workshop scene

My 1000 with 1200 motor has three inch from motor to rear last foot has 2 and a half hot dog
sounds really (bad arse,mint,cool too)even (like she has big ball,s for litle car)
that she has.
BUT note of the exhaust is like beauty is in the eye of the beholder
choose and choose carefully as it get's expensive for all replacement,s if you not like it to start with.stainless worked wonder,s for me.
I have one muffler left handle to 600 horsy's. but give of heap,s of noise at maximun flow.
MAINLY FOR HIGH POWERED MOTOR,S.
MIGHT WORK For standard motor,s tone will differ heap,s.

I have a 2" system with a glasspack Lukey muffler off the extracters. The end of the collection pipe off the extracters is 2" aswell so its a nice smooth flow out to the back.

That cost me AUD$150 for a 100% custom job extracters back in mild steel. Sounds great! And because of the pinhole in the extracters from it hitting the idler arm it crackles on downshift, it love it

Would the difference between a round straight through and an offset one really be the difference between a buzz box and a pleasant exhaust note? I'd definitely be using a resonator along with it then.

Thanks for the info. I''ll definitely be getting along with this soon enough.

I somehow jammed this Flowmaster Super 40 under my sedan. It's a little loud but I like it.

I have heard these Hooker Mufflers are great, and reasonable price from VPW.. VPW

For a 1200, the offset muffler allows you to put the muffler in the correct space, for clearance over the rear axle, which is important when you are using bigger diameter tube.

On my turbo CA18, I run a 3 inch system with a cat convertor and a 14 x 10 x 5 inch straight through muffler at the rear like a 510 (I have coilover rear). That's not too loud believe it or not. But turbos really quieten down a car at traffic speed. It's over 5000rpm that they sound like a screaming banshee.

My old CA18DE had a 2.25 system with hotdog resonator (non-turbo cars really need it), and a largish rear muffler, and it sounded great.

Quote:
That is the GX manifold that I recently purchased from "Ronald" here on the board. His picture and his shop. In Austrailia

Now back on the exhaust. How far back should I have them come together? And what size tubing? I am either going to be running the Twin SU's I bought on ebay or the single Weber side draft that I also have.




PS it was not my intent to HIJACK your Thread sundat1200



Mike