<div class='quotetop'>QUOTE(Danger DANJ)</div><div class='quotemain'>Wow, that gain really sucks. Just think, those of you with Fed specs will gain even less. I was thinking about getting these headers, but I doubt it now. I'm curious how much better the headers would work on a Cali spec with other mods or even with the SDS?</div>
That's why I did this test, for you guys who are considering. As for how it would perform with the SDS, it is required, or else you risk blowing out something in your engine, like gaskets. After comparing them to the stock manifolds, I believe Rippmods on this one.
After more extensive testing, I have some advice for those who are still actively considering this system. Please note that the headers, despite having flex pipes, feel like they're not flexing at all. In D stopped at a light my car will shudder like a battleship being shelled. Horrible really if you're stuck in stop and go traffic, but once you step on the gas it thankfully goes away. It's especially bad on my car because I have solid motor mounts (my stock ones were busted at 23k miles). As for the 9ish hp gain, the butt dyno says different. It's kinda like driving a BMW, it just feels stronger than it should. I haven't had a 0-60 run timed because of my tranny shifting problem, but step on the gas at any RPM and the response is instant and hard. It may just be that these cars are like the Mazda RX-8 when being dynoed; i.e. they put down less power than they're really rated at (and thus the highly publicized but incorrect claim that Mazda overrated the RX-8 but still bought them back anyway) due to the car's brain realizing something isn't right. The exhaust leak though is starting to really get on my nerves. If you can picture a late '60s diesel truck ticking away as it accelerates, you will have just about the perfect sound of my car. As for the hissing when I accelerate or let off the gas I have no idea whether or not it's from the flow of exhaust or from the leak.
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