Big Geek

iTrader: (2)

Can you say monster?

Jim C.

RyanJ

But it necks down. Is that really a 5" downpipe? I personally don't think so.

Big Geek

iTrader: (2)

That is just one of them. I can't find a pic on Jason's site for the one that doesn't but he can build em anyway that is needed.

Jim C.

TS6

iTrader: (41)

There are gains to be had with a larger downpipe that necks down. It reduces backpressure at the turbine outlet, and helps with velocity.

NOSjohn

iTrader: (9)

Yep, that is a big'un...looks like a nice piece.

smokinHawk

iTrader: (48)

ya a little bit. Na$ty-Ta's is like that coming off his GT42. also speed inc did that to one of their turbo kits in their shop car

Big Geek

iTrader: (2)

I was gonna splain that too but I have already been in one pizzing match today and didn't want to take the chance on getting into another being that I don't know the gent. In addition to the added volume nearest the turbine the taper can also create a scavenging effect that helps with the velocity of the exhaust gasses leaving the turbine and thus as you stated helping backpresssure. Thank you for pointing that out as I wanted to make sure I didn't ruffle anymore feathers today.

Jim C.

RyanJ

I woundn't start a pissing match about this stuff. There's so much to turbo technology and its so wide open in terms of turbo specs and combo's its not even worthwhile. However, IMO, the only reason to neck down anything in your exhaust is to cater to some space/size issue.

Wet 1

iTrader: (4)

The 90* elbow is the largest restriction for that pipe layout, having the reduction after the elbow is what's really key.

F8LWS6

iTrader: (11)

Thats the RJC 5 inch downpipe! I remember when they came out with that. That thing is definetly monster size.

http://www.rjcracing.com/RJC_Buick_P...5in_dpipe.html

More pics there.

NA$TY-TA

iTrader: (21)

Yep im 5" off the turbo stepped down to 4"..... and its to clear thru the K-Memeber.....

We were going to try a 5" all the way like this



But decided to do it like this.....



Kyle

Big Geek

iTrader: (2)

Good looking setup there chief. To the gent above you are correct in that it is Jason's piece. That guy does some GREAT work. A1 guy to boot!!!

Jim C.

Pro Stock John

iTrader: (34)

Wow you guys are building some crazy race cars, that's all I can say.

F8LWS6

iTrader: (11)

For sure. The power plate is awesome. Got em on both the cars.

89Formulaws6

iTrader: (52)

wow thats crazy i didn't think a 5in d/p would be needed

i've seen those on diesels before tho