Boost Design dp and exhaust?

[ShionS14]

i was wanting to know if the boost design down pipe and there exhaust system allow for the cat to still be in place? we had a new emissions law pass here so now i have to worry about that crap

[Jeff240sx]

i was wanting to know if the boost design down pipe and there exhaust system allow for the cat to still be in place? we had a new emissions law pass here so now i have to worry about that crap

Nope. It all goes. EGR. 2nd O2 sensor. Real cat. Even the fake cat, so you can't pass a visual or even stick a high flow cat in there to pass smog-only. I've always said their design was a shot in their foot.-Jeff

[fiznat]

I've never seen it in person but I'm sure the pipe can be modified allow for a cat, it would just require some work. ...Depends what you want, and how much money you're willing to spend modifying an exhaust you just bought brand new...

[WDRacing]

Yeah, BD makes it so you have to buy their exhaust to use their downpipe. So no cat, no catback exhaust and more money for BD.

[Import_Ant]

ooh! ooh! go with a BRM. it will make you smile from ear2 ear and you can still use any cat with it.

I'm running a Greddy DP to test pipe to BRM 3" catback and it sounds awesome. no raspyness just a nice mellow tone.

[WDRacing]

My next exhaust purchase will also be BRM...but they do not fit with the BD downpipe.

[Import_Ant]

My next exhaust purchase will also be BRM...but they do not fit with the BD downpipe.

that was another reason I got the kit I did. they made an 'upper-downpipe' from the turbo to mate with the Greddy DP so it basically exits where a stock SR/CA would. I can use any DP designed for those cars and any exhaust as well pure genious!

[ShionS14]

well i guess my best bet would be to go with the greddy kit then since it passes cali's emissions or i could be a sneaky little sob and go to a different county to get my inspection done

[get_up_mark]

you can use the bd downpipe without their exhaust but you need to cut a piece of 3 inch pipeing and weld it in some strange contortion. i got this info from someone on the forum who said there exhaust didnt line up with the bd mani. it can be done.

[Jeff240sx]

you can use the bd downpipe without their exhaust but you need to cut a piece of 3 inch pipeing and weld it in some strange contortion. i got this info from someone on the forum who said there exhaust didnt line up with the bd mani. it can be done.

You can always do anything, provided you throw time and money at it.

The first pic's arrows point to where I had to cut the pipe in half, rotate it 180*, and then insert metal spacer rings in order to use that ford 5-bolt flange. I also needed another spacer ring, and an ATP 2.5 -> 3" transition. That was ~3 hours of time there.Then the last two pics show what I had to do to my old greddy sr20det downpipe to mate with the BD manifold. The arrow in the last pic is pointing at a bolt shown in the 2nd pic, for refrence.

And to whoever said you can put a cat in there.. sure, if you cut a chunk of pipe out of the BD exhaust you can weld one in. Or weld flanges on the exhaust halves. But.. that goes along with the "if you throw time and money at the problem, you can do anything" ideal. Now, should one have to hack up brand new stuff because it's idiotically designed and doesn't allow for or care about emissions for the majority of people who live in smog/visual states? I just think that making a full length downpipe to mate at the cat, and a cat-back exhaust are the way to go. How many are KA-T who didn't already have an exhaust? How many NA want a cheap(er) exhaust alternative, and would buy this if it didn't delete the cat and need a crazy pipe fabbed to mate with the stock header, or have to hack half the exhaust off and throw it away to mate with aftermarket headers? It's just assinine I tell you.-Jeff

[AZhitman]

For those who want to use the BD Dp with a BRM, I will include a 3/8" billet flange ($10 value) with your order.

I'll be lopping off the BD flange and replacing with a more conventional flange as well.

[D Money]

i've heard some bad stuff about Bd lately, which is why i bought a revhard mani

[chandler]

heck, one of the reasons I didnt get the bd kit is because I love my brm exhaust

[AZhitman]

Thanks Chandler.

We try hard, and the best praise comes from you guys, the satisfied customers.

[Fenvy]

can brm produce exhaust manufild?

by the way how much is the rev hard manifold?

[AZhitman]

No, we leave manifolds to the experts.