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Yeah, from what I've seen on the boards you're looking at around 175-180whp with bolt-ons and some Evo cams. Though, it seems counter intuitive to me that you would want to use cams setup for a forced induction motor on an NA car but there isn't really a lot by way of NA aftermarket support beyond cold air intakes for the 4B11.

If you are willing to do an E85 setup, you could build the motor for higher compression. I would not increase displacement as it would not rev as well and would make the car less driveable.

This might be helpful
286725


In the end, if you want to make more power either look at going with a 4b11t setup. The Ralliart is actually a really nice package if you want really fast spool on a budget.

If you really want an NA build, look into getting a transmission adapter for a K-series. There's an art to making HP on an NA car and the Honda K market has it down.
 

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There's nothing wrong wanting to keep the Mitsu powerplant and the 4B11 is probably the best option for a built N/A as it will rev higher than the 4B12. I think cams and uprated springs and retainers will be you biggest gains with proper tuning and a higher redline. N/A is all about flow and velocity. Headers and a free flowing cat-back. Check out the Blitz intake manifold if you're feeling rich one day ;)
 
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