G5King

So, I've pretty much read up on all that is the JBP header. What I haven't seen is any mention of it being used on a 2.2.

Before I continue. I'm not looking for opinions on the header as a whole. I don't much care if you don't like the way it sounds, or if you think it's too expensive or too hard to install. I'm not worried about that stuff.

What I am worried about is the size of the primaries and the collector, and how much it will help/hinder the performance and sound on a 2.2. Currently I have the OBX header. It has 1 1/2" primaries and a 3" collector that is reduced down to 2 1/2". That, with a custom DP I got from Pacific Cobalt and a Tsudo exhuast, give me sounds and gains I'm not so pleased with.

The JBP has 1 5/8" primaries and a 3" collector with no reducer. My question is, how stupid would it be to strap this to a 2.2? I would get the vortex DP too, I suppose. I'm worried that it would be too big and give more rasp than growl, and also that it would kill the low-end and not give any more on the high-end than what I currently have with the OBX. Damn it's so tempting though.

I have heard some not great things about JBP's customer service. I was wondering if it would be worth contacting them and seeing if they would consider building the header with 1 1/2" primaries and a 2 1/2" collector? Since they make the header after you order, I wouldn't see why it would be a problem if they have the resources on hand.

Comments?

Damn. Internet lag=two threads. Mods if you could delete one please. Sorry 'bout that.

ls1fbody

3" for an N/A 2.2 is far too much. you will lose a LOT on the low end. It will probably sound cool, but thats about it.

1 5/8" is not a whole lot bigger than 1 1/2" you know that right? the difference of an 8th on an inch is not much. Now, if you kept the 3" collector, and had a DP made that reduces from 3" to 2 1/2" you might be good to go that way.

G5King

I wonder if JBP would make the collector 2 1/2" instead of 3" for me, since they are made after the order is placed.

I knew 3" is too big. I was hoping for ideas to reduce it, like your DP idea. Good call.

D4u2s0t

way too big. you don't want to come anywhere NEAR 3" on a 2.2 2.5" MAX for an n/a 2.2 that is not highly built. and it's probably a little too big at that. basically, that header is not the way to go for you. reducing it won't help any. you're most likely losing power with what you have now, and will lose more going to the obx. i would get a smaller collector altogether and ditch what you have.

G5King

I'm not sure I follow. I fully understand that the JBP is too big. I knew that from the get-go, I was just wondering if somebody would pop out and say that did it and it's fine.

So you're saying that my current setup (1.5" primaries, 3" collector that exits at 2.25" through a reducer, 2.25" catted DP, and 2.25" exhaust) is too big? I don't see how that is possible, but I'd like to here more on your reasoning.

Again, do you think JBP would use smaller tubing and make one more suited for N/A builds?

ls1fbody

They might, but the jig they have is set up for 5/8 piping. contact them, it never hurts to ask.

that and the flange that bolts up to the head has holes machined for 5/8ths.

G5King

I think I could live with 1 5/8" primaries, but I would like to see if they could, or if it's even possible, to reduce the collector from 3" to 2 1/2" or 2 1/4". Best scenario would be 1 1/2" primaries into a 2 1/4" collector.

I don't have the funds right now, which is why I won't waste their time with answering my questions.

D4u2s0t

you're losing velocity in the 3" section of pipe. doesn't matter that it's reduced down. the idea of going with an aftermarket exhaust setup is to maximize the velocity. by going from a 3" down to a 2.25" you're not maximizing the velocity.

and is it reduced down to 2.5 or 2.25? because you said 2 different things in this post. either way, it's not ideal at all.

G5King

I see. So does any aftermarket header run a 2 1/2" or 2 1/4" collector?

NM, I'll just search.

D4u2s0t

look up the zzp midlengh header/downpipe combo. it's a great piece and will be the right size for you.

G5King

Yeah that looks like my best bet. Thanks man.

D4u2s0t

no prob. feel free to pm if u have any other questions. best of luck!

G5King

Thanks. I think I'll shoot JBP a PM about my idea before I do anything. I guess it's worth a shot.