Injen 99-00 Civic Si Polished Cold Air Intake

Injen 99-00 Civic Si Polished Cold Air Intake

Marsoni

M251S

$187.22

Get it in 3 business days with 1 day shipping. Friday, May 29

Injen 99-00 Civic Si Polished Cold Air IntakeAdd some easy horsepower to your Ride with this RD Series Performance cold air intake (CAI) from Injen Technology! The engineers at Injen have spent considerable amounts of time designing, testing, and perfecting this CAI to produce some serious bolt on power while also providing amazing engine bay aesthetics. In addition to the impressive power increase, the Injen team has ensured that safe Air fuel (A F) ratios are maintained throughout the

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MUCH better than the cheap plastic OEM part, Just a reminder though, these thread into an aluminum block so be very careful to start them finger tight first, then evenly tighten both bolts to push the fitting into the chamber. If you don't, it will slightly misalign and you run the risk of stripping the threads. The one comes with the replacement o ring, and be sure to get some antifreeze on that seal prior to attempting to push it into the chamber. IT IS A TIGHT FIT, but that's what you want, so just be careful. You might also want an extra hose clamp on hand, as the one that came with this began to bend as it got tight, so I had to replace it for peace of mind. Overall, great product though.

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Reviewed in the United States on January 9, 2026

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Dklnyc

Alexandria, US

★★★★★ 5

Strong product

Great quality

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Reviewed in the United States on March 11, 2026

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Sebastian Benavides

Louisville, US

★★★★★ 1

Snapped bolt

I tried putting it on my n55 from a m235i and it did not fit properly. I was in a rush to try to put it on and thought it was on properly and I thought it did. And I snapped the bolt because the bolt because it was not aligned after I looked at harder I do not recommend for a n55. do not get this cheaply made pos. I recommend getting it from fcp euro where parts will actually fit and not fail.

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Reviewed in the United States on January 1, 2026

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Baldemarg

Louisville, US

★★★★★ 5

May not fit correctly or is difficult to fit on.

Would not advise buying. It wouldn’t fit with the o ring nor with the old one, it would only go in with no o ring. So I had to put back my old hinge and o ring. Edit: I had to add coolant to the O ring, along with somewhat forcing/prying it in in order to get it to fit flush.

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Reviewed in the United States on January 9, 2026

Verified Purchase

Johnetta

Bozeman, US

★★★★★ 5

Works 100% on my f30 n55

No leaks made with good material you can use everything they send it will work

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Reviewed in the United States on May 26, 2026