[klipseracer]

Originally Posted by stimpy

Very cool I was out on your side of town yesterday/today. Who made them and who's doing the install?

BB Fab were the only people willing to work with my ideas and put this together. I'm doing the install.

[bulldog_yyc]

Originally Posted by klipseracer

This is pretty much the idea. The point of going back to 2.5" almost solely rests on the fact that unless you're pushing 600whp+ full 3" probably isn't necessary and will incur some losses in torque. The fact that I can slap the stock exhaust right on to this and even the bmw performance exhaust is one more reason to do it. I can't wait to find out what this sounds like coupled with the stock exhaust.

While I can appreciate the practicality of the taper down to 2.5", did you not state you were going to upgrade your turbos? Unless you do a formal analysis, how do you know 600 WHP is the threshold for a full 3" turbo back exhaust? The real number could be 500 WHP, which is quite attainable with meth and no2 today.

[UAP1]

Originally Posted by klipseracer

Currently these are made by an existing downpipe manufacturer, however they are currently a one-off product done by request. This also applies to the midpipes. Once they are all installed and everything I'll report back and maybe there will be enough interest to justify making a marketable product.

Keep us in the loop bro! I would be interested!

[mig28]

are u going to use the BMW perfomance exhaust muffler on this 3' downpipe?taper to 2,5?

[klipseracer]

Originally Posted by turkish335

While I can appreciate the practicality of the taper down to 2.5", did you not state you were going to upgrade your turbos? Unless you do a formal analysis, how do you know 600 WHP is the threshold for a full 3" turbo back exhaust? The real number could be 500 WHP, which is quite attainable with meth and no2 today.

My analysis is from Abid at ASR. I can not quote the exact power figures, but he is standing at 540whp and told me full 3" is not necessary, in fact he saw power losses. Hope that answers your question.w

Originally Posted by UAP1

Keep us in the loop bro! I would be interested!

Don't worry, I've got one of the more involved projects on this board and fully intend on keeping everyone updated. The results will be a blanket statement since I won't be dynoing this individual upgrade.

Originally Posted by mig28

are u going to use the BMW perfomance exhaust muffler on this 3' downpipe?taper to 2,5?

No, just stock exhaust and then later a custom one.

[midlife]

Originally Posted by turkish335

While I can appreciate the practicality of the taper down to 2.5", did you not state you were going to upgrade your turbos? Unless you do a formal analysis, how do you know 600 WHP is the threshold for a full 3" turbo back exhaust? The real number could be 500 WHP, which is quite attainable with meth and no2 today.

1/ good question !

not sure if the OP had 2.5 inch dps before and therefore can supply a before and after dyno when he gets these new THREE inch dps and midpipe in.

2/ congrats to the OP for doing this.
A few people including me have asked in exhaust threads: why no one has done a full 3" dp.

IMHO, if the OP's fabricator wants to market these dps and matching mid pipe - they should figure out your question.

fwiw. Mr 5 has already demonstrated solid gains from the AR type dps which taper to 2.5 inches later than the other standard 2.5 inch dps.

[Terrance28]

Looks like BB is doing some good work.

[stimpy]

Klips - where do you plan on dyno'ing out here? I'd like to see what I'm putting down before it gets hot.

[jpirelli]

Damn, so sick!

[klipseracer]

Originally Posted by stimpy

Klips - where do you plan on dyno'ing out here? I'd like to see what I'm putting down before it gets hot.

Well, I've only been to the dyno once and I went to lopers on camelback. I forget how much he charged me, it was too much I know that. He doesn't do 'three runs'. He just runs your car till you want him to stop and I remember it being more than the normal rate. I forget his name now, but my vette buddy said he was okay. Its a dynojet which I needed and it was close to my work which is in phx. And yeah, I advice going soon because its going to get nasty hot and our graphs won't be very comparable to our cooler and lower elevated brothren. Also, he was fairly insistent on putting the wideband on instead of the sniffer on the back... He just said he liked to do things 'right' but didn't really care cuz it was my car and I was paying. He was also not too familiar with the kick down pedal because he hit it a few times, lol. Oh yeah, and he forgot to put a fan on my car. I forgot too.

[klipseracer]

Also, anyone notice a difference besides the diameter? Hint, V-bands.

[cstavaru]

Originally Posted by klipseracer

BB Fab were the only people willing to work with my ideas and put this together. I'm doing the install.

They may gain a market. Selling a combination of 3" downpipes and 3"-2.5" tapered midpipes as a package with a nice discount may gain some traction...not bad.

[bulldog_yyc]

Originally Posted by klipseracer

My analysis is from Abid at ASR. I can not quote the exact power figures, but he is standing at 540whp and told me full 3" is not necessary, in fact he saw power losses. Hope that answers your question.w

OK, good luck with your project

[klipseracer]

Originally Posted by cstavaru

They may gain a market. Selling a combination of 3" downpipes and 3"-2.5" tapered midpipes as a package with a nice discount may gain some traction...not bad.

Just need to see the interest first... I think it will work very well, especially for anyone looking to run the stock turbos to the limit or anyone upgrading their turbos.

Originally Posted by turkish335

OK, good luck with your project

I see where you're coming from, a lot of my assumptions here are based off of back yard speculation, but it makes sense so I'm trying it.

[Proper Motion LLC]

I requested the same thing to BB at N54tech.com about 4 months ago

[SfValley335i]

V bands on both ends of the DP nice but arent those expense? I actually like the look of these DP's over AR, has a little bling to it.

[klipseracer]

Originally Posted by SfValley335i

V bands on both ends of the DP nice but arent those expense? I actually like the look of these DP's over AR, has a little bling to it.

They cost a little more, but again. I wanted this done nicely and was willing to pay.

[ProjecTBMW]

nice look forward to the updates..

[chris b.]

[Ferre86]

that shit looks so smooth!

[Sniz]

yes those are nice for sure, vbanded both sides...thats the way to go.
My 3" exhaust is fully vbanded, easy to mess with when you want adjust or remove for work reasons.

a dual 3" is WAY more than you need for this car. Hell a single 3" will handle the power levels we've seen.

[klipseracer]

Originally Posted by Sniz

yes those are nice for sure, vbanded both sides...thats the way to go.
My 3" exhaust is fully vbanded, easy to mess with when you want adjust or remove for work reasons.

a dual 3" is WAY more than you need for this car. Hell a single 3" will handle the power levels we've seen.

Thats why I'm having the mid pipes taper back down to 2.5". I agree that full 3" is completely overkill. It sounds nice as a number, however not necessary.

We've seen 7hp+ gains by extending the 3" turbo outlet diameter another 1-2 feet before tapering down to 2.5"... Why shouldn't we be able to expect another improvement by going another two feet? The exhaust gasses will certainly still be quite hot and I'm sure would respond well to the excess room before cooling. Remember, more than 1/2 the exhaust system is still 2.5" even after this change has been made...