Sgtblue

iTrader: (16)

As Evil Aviator already mentioned, there's not much to be gained from an aftermarket intake. And a tune requires a standalone ECU. Those aren't usually cheap. Neither is a tune if you can't do it yourself.

diabolical1

iTrader: (3)

as stated above, no. the stock system has two independent mufflers, but the system is not truly dual. it merges from the manifold.

mufflers? I suppose you could probably chart a power increase, even so, it would not be perceptible (outside of the likely psychological perception). the mufflers are not where the real restrictions are. for a true power increase, you need a system starting at the engine and going back.

Evil Aviator

A good catback exhaust, such as the Apexi N1 Dual 90mm or Racing Beat Power Pulse, will typically add about 3-5% more hp. An over-sized catback exhaust, such as the Apexi N1 Dual 115mm, could actually reduce hp in much of the power band.

tpotts

Based on my experience in other cars, the lightest flywheel may not always the way to go. Finding solutions is the key to performance.

joelzzz123

Like everyone else said; intake and exhaust first.

VasiliBrown

Would underdrive pulleys give me significant gains. Also i've been hearing about a throttle body mod but all the links i've tried are expired can someone tell me about that and post a link

Evil Aviator

Contrary to slick, disingenuous marketing, underdrive pulleys are not intended to be power adders. The actual purpose for underdrive pulleys is to properly drive the accessories on race engines that operate at a higher rpm than a street car. Were they not installed on a high-rpm race engine, the water pump would experience cavitation and the alternator would burn up. However, if they are installed on a street car engine, then the water pump and alternator will be under-driven, causing overheating and electrical brownout when the car is stopped or moving very slowly.

Throttle body mods are a waste of time unless you are seriously racing in a race class that requires the OEM throttle body but allows the modifications. Therefore, if you have a race car, then you will need to see the rule book for your race class to see what is allowed, and it is a good idea to check with fellow RX-7 racers to clear up the gray areas. If you want a throttle body mod that makes a real difference, then the way to go is an individual throttle body (ITB) on an aftermarket Weber IDA intake manifold, and controlled by a standalone EMS.
http://www.borlainduction.com/Thrott...carb_vs_fi.pdf

Sgtblue

iTrader: (16)

^This. And any power gain is negligible. Probably within the margin of error for most dynos and nothing your likely to feel.

gorillabrothers

iTrader: (2)

I with the tuneup at the start of the summer and good storage