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332 Posts
Big down pipe (w/ cat delete option)
Stealth and "race" exaust
ECU tuning (for those wanting beyond what Mountune will offer)
Different cold air intake design than Mountunes (looks like they just added more volume to the filter box and another air intake)
Once the limit of the stock turbo/engine is known. Bigger turbo & atleast carrying another brands internals (if they are needed for bigger HP)
Coilovers (if existing ones dont fit)
Front lip/splitter

Im aiming for a reliable 300bhp in this little car.
 

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908 Posts
PCV oil separator.

Blow-off valve upgrade.

Direct Injection fuel pump tech.

Stronger springs for the shifter.

An electronic "hoon stick" that uses the rear brakes like torque vectoring uses the fronts when we want to get our gymkhana on.
 

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The widest 15" wheels that fit but don't ruin scrub radius. An affordable AST suspension setup like 949 racing makes for the miata. About 40 more hp if the drivetrain can take it and it can pass basic emissions tests.
 

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Cold air intake, full pipe, not just an elbow
Blow off valve upgrade
bigger intercooler
downpipe would be nice and free flowing exhaust
hows a gauge pod like the focus st sound? something clean and subtle for the dash
 

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721 Posts
larger diameter downpipe
exhaust with twin angle cut tips that stick out further than the OE ones.
intake
short throw shifter
some sort of front splitter
intake to turbo inlet tube
 
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