Best Downpipes

[Yeineken]

What's the best sounding/best performance Downpipes available for the n55? Also what's the best tune to use to take care of the CEL light?

[Lmaiuri]

Do you want catted or catless? As far as clearing the CEL, JB4 has a setting that auto clears codes. I run JB4 but leave the CEL on because if another issue arises, I want to know about it. I wouldn't invest too much money into a downpipe, as it's just a tube that connects from your turbo to the midpipe. I'd go with VSRF or AFE.

[Yeineken]

Originally Posted by Lmaiuri

Do you want catted or catless? As far as clearing the CEL, JB4 has a setting that auto clears codes. I run JB4 but leave the CEL on because if another issue arises, I want to know about it. I wouldn't invest too much money into a downpipe, as it's just a tube that connects from your turbo to the midpipe. I'd go with VSRF or AFE.

Thanks, do VSRF or AFE throw the CEL?

[Skilld1]

Originally Posted by Yeineken

What's the best sounding/best performance Downpipes available for the n55? Also what's the best tune to use to take care of the CEL light?

I went with the Cobb 3" high flow cat dp, and tuned with Cobb AP stage 2+FMIC, which does not display any cel.
I read that a 4" dp could be too large for the N55, reducing torque at the expense of some added high rev HP.
I went with high flow cat because I did not want to create a gross polluter.
Even though I have stock exhaust, I enjoy the new throaty sound, and my butt dyno is amazed.

[mike@x-ph.com]

All catless DP with throw a code.
A jb4 will hide that code for you.
Get a VRSF or AA DP, never had any complaints about it.

[Lmaiuri]

Originally Posted by Skilld1

I went with the Cobb 3" high flow cat dp, and tuned with Cobb AP stage 2+FMIC, which does not display any cel.
I read that a 4" dp could be too large for the N55, reducing torque at the expense of some added high rev HP.
I went with high flow cat because I did not want to create a gross polluter.
Even though I have stock exhaust, I enjoy the new throaty sound, and my butt dyno is amazed.

You went with a high flow cat because they string you up by the nuts in California for going catless.

[BMist371]

I thought high flow cats throw CELs?

[Skilld1]

Originally Posted by BMist371

I thought high flow cats throw CELs?

...depends on the tune.

[Biggs07]

Will cobb v3 keep from throwing codes?

[vivanapoli806]

Originally Posted by Biggs07

Will cobb v3 keep from throwing codes?

If u run stage 2 tune yes it should. That's made for catless pipes

[BMist371]

The way I understood it, tune doesnt matter. The tune puts the sensors into a not ready status and they just dont read or throw codes. However, this doesn't solve the issue of passing obd-II inspection scans. In NC we have yearly inspections and I have no access to a lift to be able to wrench then on and off 4-6 times over the span that I own the car. And its crazy to pay $300+ to keep swapping them for inspections.