Ordered the Modern Performance catless D/P on Thurs.. Pipe came in on Sat. morning FedEx ground delivery. I live in Granbury, TX. about 5hr. drive from MP's facility, but I'd say that was quick service! Packaging was excellent. Cost of $239 including shipping. Their pipe has 3-O2 bungs, and a small instrumentation bung by the top flange. They included plugs for all the bungs, and they also included a 90degree fitting/pipe w/locknut for installation on the O2 on the "bung of my choice". The workmanship is excellent, nice welds. I haven't had the chance to install it yet. I hope the automatic vs. manual length issue doesn't materialize. More to come.
Thanks, Ray.

 

I plan on buying a hhr ss but curious to see if anyone has an actual list of parts that will work on the hhr ss from the cobalt ss. I called modern performance and they had very limited information besides that the downpipe will work. This will be a manual also.

Any help is appreciated

 

You will probably have to do your own leg work. Go to a GM online parts store and compare part numbers.

 

Do you have pictures of your downpipe? I recently purchase one also but from zz performance, also catless, has the angled O2 port so its not supposed to set off CEL.

 

Hello

I am on the verge of buying a 2008 ss and curious to see if there is a place that I can buy performance parts from. Will I be buying from multiple vendors....

Any help is appreciated!!