just to throw a wrench in this thread..I believe the stock N/a exhaust is just as free flowing as the Gasser exhaust. Sure the gasser has more defined runners in the manifold itself, but where it all gathers right above where it splits in to two pipes it is confronted with a turbulance causing "wall" so to speak. Now.. If you modify a toilet bowl exhaust downpipe and make it have a 2.5" exhaust manifold back you'll (in my mind) be better than the gasser exhaust. The gassers gotta pass the turbulance causing space between pipes, be forced in to small pipes, then open up in to the bigger ending, but not before taking an almost 90degree turn. SO What im saying, is that the inner diameter of the diesel exhaust is already like 2.5-2.75" The only advantage the gasser would have is if you couldn't fabricate your own down pipe. NOW this may just be another crazy Acid Trip, and I'm realllly high off my tree.. anyone care to have a discussion ? seriously though, from what ive seen.. diesel looks more free flowing
are you sure thats a gasser exhaust manifold you got there? thats the exact same manifold i pulled off my car when i put the turbo on it. and ive seen quite a few other dual down pipe diesel manifolds.
Hmmmm..... I think you're right, with a bigger downpipe the stock exhaust manifold probably wouldn't be that bad.
I pulled one like that off a '79 rabbit w/ a 1.6CIS, my '82 rabbit 1.6D has a toilet bowl, I also have a '84 rabbit w/ a carbureted 1.7 with a toilet bowl. But IIRC my 77-84 diesel bentley shows both styles for the diesel, and the 77-84 gasser bentley also shows both styles too, I think the toilet bowl mustuv came on later models.
the gas manifold gives you better power. end of story. my car likes the gas manifold better.
Quote from: "rabbitman"I pulled one like that off a '79 rabbit w/ a 1.6CIS, my '82 rabbit 1.6D has a toilet bowl, I also have a '84 rabbit w/ a carbureted 1.7 with a toilet bowl. But IIRC my 77-84 diesel bentley shows both styles for the diesel, and the 77-84 gasser bentley also shows both styles too, I think the toilet bowl mustuv came on later models.Yeah, I've seen several different variations of manifold and downpipe configurations in the different service manuals for these cars. In one of my manuals it shows a swivel type manifold with a merged collector and dual downpipe! I've never seen one of those in the flesh, but apparently something out there came with it. Quote from: "Rabbit on Roids" the gas manifold gives you better power. end of story. my car likes the gas manifold better.Which gas intake manifold did you use? Externally most of the non-crossflow ones are similar (except for the throttle body being on the other side of course) but some flow much more than others, some have more material for porting, etc.
ive got a manifold off a RV code Digifant 1 engine from a 90 - 92 jetta/golf. when it was on my jetta, i had a k&n intake system on it, and it friggen roared. so when that engine came out of my jetta, i had this manifold laying around, and i was never really fond of the turbo intake, as the runners are pretty much right angles. and the digi manifold had way bigger runners than the n/a and t/d manifolds. another user got pretty mad at me because he says the n/a diesel manifolds have bigger runners. i had to port my head a bit just to gasket match it with the intake. but whatever, i accidently put a gas intake on my engine, loved it, and will never go back. and no one can tell me otherwise.. until i build my own custom intake :twisted:
the earlier CIS manifolds (like the OP has) sucked compared to the later digi manifolds, particularly the G60 one.
