Stock, i'd do 2.5". I def wouldn't do 3" on a stock stock motor.
These lifters aren't designed for 20w50. Excess valvetrain friction. No good. But if we're talkin 8v, they'll run forever anyway.
Edit, but i think it's important to notice that i had no torque loss going to 3". Should tell a story about exhausts on these motors.
Last edited by root beer; 07-31-2010 at 11:12 AM.
Thanks for all the hard work on this to all those involved. MUCH appreciated. We've been arguing 2.5" vs. 3" for a long time over on the Corrado forum:
I would never say that 5whp is worth $400. It's just something to think about. Price a TT kit and a test pipe though, and compare. If you're making that choice, knowing that a 3" exhaust could yield more power might sway a decision when picking an exhaust from the get-go.
I would still recommend TT kits over all others for most cars. Anybody with fany type of forced induction though....this is the kit you want.
No, i haven't had a chance to get up there with a flashdrive. Tomorrow at the latest.
Updated the first post with a graph
I havent been following the 12v NA scene much but I did see those very nice new headers that were made.
Id like to see those thrown on this car with the 3" exhaust and see what kind of numbers it produces
Eh, i'd assume so. Maybe comparable on an all stock motor. Not worth testing for me.
I can say without hesitation that many many people wonder about this, but they're 'all' afraid to say it around here for fear of some kid making jokes about them on the internet. I wish I was still sitting at the same money as I was a year or so ago, I'm really into testing different ideas especially the ones that others seem 'pointless'.
Like it was said earlier, there are FAR too many invisible internet dyno results floating around...and not NEARLY enough actual real life testing going on. You see it every day someone will ask about a 2.0 mod, and you get 50 different responses of varying 'low and slow' or 'drive it downhill' garbage. I remember the days when you did a mod and gained 2-3hp and it was a GOOD thing. Now, it seems that unless you can possibly make 300whp it's not worth doing? Seriously...it's just a kid on the internet making jokes, man up and get back to real testing...they'll go away eventually anyway when they find the new 'in' thing.
This VR6 test/study is awesome, I really hope more like it appear in the short future.
Now to touch on the opinions of 2.5 VS. 3" I completely agree that on a stock car there is absolutely no reason to be running a 3" system and i would most certainly put a 2.5" system over the 3" system. Which is also the reason that the 2.5" system from us has been developed for the MK3 platform cars and will be released and available shortly
You mean my exhaust that i was running? It was a ported stock downpipe and manifolds/42dd test pipe/tt borla
All in the details homie, good luck. Pm me if you catch a dilemma.
Does exhaust size of that much difference effect back pressure on turboz? I would look up numbers on different size exhaust on vrt's. One I know where I live uses his stock muffler and has good numbers 80hp of boost
Last edited by 1337cshacker; 09-04-2010 at 02:45 AM.
This is all i have to say about turbo exhaust systems
i've got a S2 metalwerks header on my car. Noticable difference throughout the rev range but i did lose a tad of low end...mid range and upper rpm though definitly show improvements but i've yet to get it on the dyno.
I might have to invest in a 3inch and see what it does with that
Last edited by WannabeVWguy; 09-04-2010 at 10:11 AM.