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I have a 2007 civic si and wanted to know what would be a good coilover system to lower my car and yet still have good performance. I'd like to stay under $1,000.00.

 
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I posted this in the other thread you posted in, but here it is again.

Dropping a grand on a set of coilovers isn't a bad price. Just sayin.
I personally have a set of Tein SS-P's on my 02 ex coupe. I've had them on since 2005, and I absolutely love 'em.

Below is a link with tein SS and basic coilovers, as well as a set of progress coilovers, both great brands. The difference between the basics and the SS's is the SS's have adjustable dampering as well as height. The basics only have adjustable height.

The basics will run you just over a grand, the progress about 75 bucks over that, and the ss's will run you $1400
http://www.thmotorsports.com/suspens...s/c-10110.aspx

 
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What about the honda factory sport suspension, it lower's the car an 1 1/2'' which is all i want really and it only cost $500

 
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Like riceboy said, some of my favorite aftermarkets coilovers are tien or progress. Though some of the best suspension is oem. The 2 best sport oem suspension is the HFP or the Mugen.