Also, are the pre-cats on the stock DP or connected to it? If they are would that affect emissions, not that I really care, but the shop might. I kept the cats to replace the testpipe when I have to go for emissions, but is that enough to pass or do I actually need the pre-cats?
An exhaust shop here in Ft. Worth fabricated my exhaust from the turbos all the way back, so yes, it can be done. Mine is made of aluminized steel and is pressure bent, so it doesn't flow quite as well as a mandrel bent set up and isn't as pretty, but it made a huge difference.
Supposedly, you should be able to pass emissions with just the main cat. You should drive your car around for a little while prior to getting it tested just to get things nice and hot.
I would just ask the exhaust shop to make you straight pipes from the header past the cats to the exhaust. my boy did that w/ his NA supra. (i dont know really the comparison w/ straight pipes and aftermarket dp specs)
or you could just ask them to make you a dp and keep the testpipe so you could replace it w/ the cat for emissions
i have a 95 NA, i didnt even know we had precats but ive seen the stock dp and there are not cats on it
Just realized that he was an N/A. You shouldn't have a problem with passing emissions as long as you retain the cat after the DP. Only thing is, you're gonna lose some low end torque if you go with a better flowing setup. I noticed in your sig that you're already dealing with that with your current mods and this will only make it more noticeable.
Yeah, I want to keep the testpipe. I don't have to worry about emissions out here, but when I finally move back to Arlington I will. Out here they're just like "Oh, you're lights work. Here's your sticker." I didn't know we had pre-cats either until I saw it a minute ago in another post.
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