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Cheapest way to boost a 318i's horsepower?

6K views 5 replies 4 participants last post by  318i-Bmw 
#1 ·
I was just wondering what the easy and cheapest thing to buy to get more horsepower out of my car?
 
#2 ·
intake, exhaust, weight reduction, new plugs, cams, on down the line....


or a i6 swap, maybe something tasteful like an s50
 
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