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Theory w/ aftermarket DP's Posted by ryan [Email] (#2222) [Profile/Gallery] (more from ryan) on Wed, 2 Feb 2011 11:40:42 In Reply to: Re: Performance DP versus factory DP, Peter Martin [Profile/Gallery] , Sun, 30 Jan 2011 13:44:05 Members do not see ads below this line. - Help Keep This Site Online - Signup |
I have the same problem with the GS downpipe on my Viggen. I have heard that this problem stems ONLY from the fact that the cat is relocated further downstream in the exhaust than even the rear-most one on the factory setup (no longer directly underneath the oil pan). This, and the fact that it has less restriction, allow for a cooler-operating cat, and doesn't reach the optimum temperature when you are driving the car easily. I only trip 0420 when I'm driving very gently (ie. flat constant speed freeway drives).
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