Highest yielding HP mods for M3 excluding S/C

[sbo76]

Originally Posted by Scharbag

I have test pipes and Dinan cans. Car is not loud and even at WOT it is far quieter than a lot of current production cars like Corvettes and Mustangs.

Thanks for the reply’s! I need to start researching which tune I want!

[smokinjoe64]

Originally Posted by sbo76

Thanks for the reply’s! I need to start researching which tune I want!

Suggest take a look at Alpine tune...lots of posts/info available

[pbonsalb]

My recommendation is Epic.

[tom @ eas]

We have a few examples in this thread here, along with dynos and build details:

400 RWHP Club?
https://www.m3post.com/forums/showthread.php?t=788241

[CamasM3e93]

Originally Posted by Bulb

Is there any consensus on pulleys? Some people say they are one of the most efficient ways to get hp gains, but I saw someone talking about it impeding the engine's ability to cool or something.

It depends on the pulley design. Some are lighter material but the same size as OEM so the water pump sees no change. Mine (I think it's Turner but I'd have to look it up to confirm) has a smaller pulley for the belt that drives the water pump. This means the water pump isn't being driven as quickly per revolution of the engine.

In normal street driving the engine will not run hotter because the thermostat hasn't changed and the flow of the water pump is still adequate to remove heat (in the PNW). But I imagine with persistently hotter driving, and especially harder driving in hotter areas of the country - the engine will trend hotter due to the lower coolant flow.

In my area of the country and with my driving, I've not seen my engine running hotter.