2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

do i really need to keep my airpump

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Old Jan 19, 2010 | 08:19 AM
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FL do i really need to keep my airpump

Ok, prior to getting my new exhaust i read that with aftermarket exhaust i wouldnt need to keep the airpump. when i installed the new exhaust i was expecting it to replace the cat that has the pipe from the airpump in it but it did not. I have an 87 TII. So do I still need to keep it? Thanks as always
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Old Jan 19, 2010 | 09:28 AM
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The Cat needs air, and to get the Air u need the tube, to connect the tube you'll need the pump.

Hope that answered your question.
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Old Jan 19, 2010 | 09:37 AM
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The pump creates hardly any drag on the engine and weighs less than your *girlfriends left boob. If you need to pass emissions, you have to have it and you'll foul your cat in no time without it.

Unless you have no emission testing, and no cat that needs fresh air, then remove it. There really isn't any gain though.



*this assumes you have a girlfriend
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Old Jan 19, 2010 | 10:23 AM
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im not concerned about the weight savings. I just want to clean up the engine bay a bit. i may just eliminate the cat cause we dont have emissions here
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Old Jan 19, 2010 | 11:35 AM
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Engine emits a lot of bad stuff out.

CAT is not really a good solution, but at least it get rid of some of the harsh stuff ... just my opinion on the matter.
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Old Jan 19, 2010 | 01:17 PM
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i heard that the pump is needed to open some ports? is this true or is this only for NA cars?
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Old Jan 19, 2010 | 02:01 PM
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Originally Posted by agustin lopez
i heard that the pump is needed to open some ports? is this true or is this only for NA cars?
this is true for s5 n/a
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Old Jan 19, 2010 | 02:17 PM
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if i was to put on a high flow cat then no air pump is required correct? Thanks again. My DP will be here thursday so i was debating doing all in one day.
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Old Jan 19, 2010 | 03:11 PM
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Originally Posted by florotory
if i was to put on a high flow cat then no air pump is required correct? Thanks again. My DP will be here thursday so i was debating doing all in one day.
No, the high flow cats designed for the FC all have the split air tube on it, which means you need the airpump. You could experiment with the $100 dollar magnaflow high flow cats, the newest ones (99,000 Series) which have supposedly heavily loaded catalyst in it. Use the biggest one available, I think it covers 7.8L engine or something like that. It might or might not last very long, (no one has tried it as far as I know, so it's experiemental) though this is what I might be planning to do. You will have to build your own flanges for it and length to what you need it to be, but it is still cheaper than high flow cats sold strictly for our cars....
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Old Jan 19, 2010 | 03:15 PM
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Originally Posted by jjcobm
No, the high flow cats designed for the FC all have the split air tube on it, which means you need the airpump. You could experiment with the $100 dollar magnaflow high flow cats, the newest ones (99,000 Series) which have supposedly heavily loaded catalyst in it. Use the biggest one available, I think it covers 7.8L engine or something like that. It might or might not last very long, (no one has tried it as far as I know) though this is what I might be planning to do. I am hoping it wont overheat since it is probably the biggest one magnaflow sells. You will have to build your own flanges for it and length to what you need it to be, but it is still cheaper than high flow cats sold strictly for our cars....
Ill look into it. Also The apexi that i have has a cat with it. could I just remove the Oem cat and have a pipe made to connect it to the DP?
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Old Jan 19, 2010 | 03:20 PM
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Originally Posted by florotory
Ill look into it. Also The apexi that i have has a cat with it. could I just remove the Oem cat and have a pipe made to connect it to the DP?
Yes, but trust me, you will smell like fumes and you will probably get sick of it idling in traffic (telling you from experience, other members will agree). If you insist, take it to a shop that is willing to make you one, (don't tell them what it's for, just say you want a pipe "x length" and you might need to supply flanges). You might also be interested in the 99,000 magnaflow "spun" cats (the 6.2L version), those look interesting but I am not sure how well they will perform. Again it's all experimental

By the way, Apexi cat-backs don't have catalytic converters (or at least not from the factory). Are you sure its not just a pre-silencer?
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Old Jan 19, 2010 | 08:04 PM
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ya prob just a presilencer.
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