For those of you with ZZP DPs, and still have the OEM Cat in the OEM DP, then check out the ZZP DP page! From their site:

For a limited time ZZPerformance will be giving out $50 coupon codes for returning your stock downpipe to ZZP for catalytic converter recycling. You don't even have to pay for return shipping! Simply select "prepaid return label" from the drop down and we'll send you a return shipping label with your purchase. Then put your old downpipe (or just the cat) in the package that the new one comes in and drop it off at any UPS shipper. We'll email you a coupon code good for $50 off of your next ZZP purchase! Returned units can be cut up but the OEM converter must be intact. Already bought our downpipe? We'll still offer the $50 coupon code but you'll have to pay for the return shipping. To take advantage send to:

ZZPerformance

Attn: Core Returns

2575 28th st SW

Wyoming MI 49519

For everyone: Include your original order # and email address to send the coupon code. Write down your return tracking number for your records!