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Can anyone help me with a cat back system and what brand of coilovers for doing road course racing and solo races
 

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Pretty happy with full race cat back. It's 3". I think the other option is Skunk 2 for 3" but it's known to be the loudest.
Coilovers, I have no knowledge of. I think truharts get brought up alot.
 

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I 2nd the full race exhaust. No need to make your car as loud as possible and i dont do autocross but i like doing spirited driving on twisty back roads and ive been running tein street advance and they handle great to me but id also recommend doing some braces if youre serious about tracking.
 

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Stay away from afe, as a 2012 Si I drove with one installed was like riding in a 55 gallon drum - loud and droney.
 

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I run the Invidia Q300 with catted RV-6 downpipe. Not too loud, but you can hear me coming. Coilovers are a littler harder to pick, kind of depends on what you want to use the car for.
 

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Ive got the full race catted downpipe with the full race exhaust and its quiet when i want it when doing normal every day driving and then it really wakes up when i want it while going through the gears.
 

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As far as exhaust, I would stick with a 3" DP (fullrace, skunk2, ultimate racing, etc.). I've read that ~90% of the power gains with a good tune comes from the DP, the other 2 ~5% is from intake and exhaust.

As for coilovers, it was recommended to me by a reliable source who tracks and races their 9th gen, to get GodSpeed Monomaxx coilovers. I was skeptical at first because of the price, but was reassured that these things were great. I've put around 8k miles on them, both on the streets and small tracks and they've been incredible, especially for the price. Granted, the vendor could've upsold me more expensive coilovers (I was actually looking to spend over 1000 for coilovers), but they guaranteed their quality and longevity. They do have a higher springs rate of 10k front and 14k rear.
 
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