Catless downpipe
Senior Member
Joined: 03-04-2010
Posts: 458
From: SE Wisconsin
If you already have a catback I would suggest a highflow catted downpipe of 2.5". Otherwise your hhr will be loud as f*** and it will drone you out. Gains will be almost the same between the two anyway.
Rest In Peace
Joined: 06-13-2010
Posts: 2,301
From: IL.
And if you don't already have one, add a Header. 
Maybe 10 with the header?
I have to Pass Emissions testing here so I went to the high flo catted down pipe.
Alot more "Performance" info about our Ecotecs on the Cobalt forums, so responses tend to come quicker.
Maybe 10 with the header?
I have to Pass Emissions testing here so I went to the high flo catted down pipe.
Alot more "Performance" info about our Ecotecs on the Cobalt forums, so responses tend to come quicker.
Rest In Peace
Joined: 06-13-2010
Posts: 2,301
From: IL.
Bad Mab, ZZP have them.
Bad Mabs are $189.99, luckily I got mine slightly used and got it locally for $40.00.
I resurfaced the flange on my Delta Stationary Belt / Dist sander and it's good as new.
I think the guy I got it from had a exhaust leak and decided to buy yet another header instead of a 10 minute resurfacing job. I don't think he knew they could be resurfaced to reflatten the flange.
You can see here this side was just about done.
Finished
Took me maybe 10-15 minutes per side on my stationary belt sander to correct it.
Someone is selling a Bad Mab on the cobalt forums, I think they are asking $130.00 for it.
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