I would think Performance Products would be a good choice to find it.
When you are dropping in a K&N, remember that you won't really get full benefit unless you also open up your exhaust. Think of the engine as a big air pump. More air in quicker, more air out quicker. It will help but it will be incremental.
On a 93 500E I improved mileage by about 3.5MPG with Cold Air Induction and a Borla exhaust system. Since I had to replace the exhaust system anyway it was not a "replace for savings" type R&R.
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When you are dropping in a K&N, remember that you won't really get full benefit unless you also open up your exhaust. Think of the engine as a big air pump. More air in quicker, more air out quicker. It will help but it will be incremental.
On a 93 500E I improved mileage by about 3.5MPG with Cold Air Induction and a Borla exhaust system. Since I had to replace the exhaust system anyway it was not a "replace for savings" type R&R.
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