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Hello,
I've read posts from folks who have tried various setups, and I have also tried several configurations myself. Most say that for power, using two round K&N filters in simple pre-1969 fashion is best. Improved horsepower setups from Volvo back in the day included one huge air filter over two SUs and no CAI. I tried a CAI type setup using stock and then Autozone components, but didn't see any improvement in performance from my B20 (I live in TN, and have had good results with a CAI in another vehicle model). However, a couple of people swear by them and I wish you the best of luck in your endeavors!
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