HKS's marketing gurus say "The Transistor Ignition controls currentto the coil via an impedance matching circuit, to produce a longer sparkduration. This powerful combination creates greater horsepower at higherRPM levels and increased throttle response at lower RPM levels."

Whatever the pundits say, I am glad I did the install and I certainlynoticed a subtle difference particularly related to throttle response.The car seems to idle and run a lot smoother too. This install was doneon my 1995TT by Turbodoug

Items:

HKS Twin Power Ignition Amplifier (TPIA)
Velcro or similar to mount the unit
Length of 12 Gauge Electrical Wire
Bullet Connector (1 male, one female)
Soldering Iron and Solder
Electrical Tape
Cable Ties (to make it all nice and tidy)

Procedure:

Fundamentally, the installation requires that the red wire go to a +12Vignition source, the yellow wires go to the igniter wires on each coiland the black wire goes to ground. The following steps outline the procedureperformed for my install.

1. Find a suitable mounting point for the TPIA, Mine is installed nearto the Power Steering Reservoir next to my HID ballast (1.). Mountit by drilling a hole and screwing it down, or the velcro strips I usedprovide more than adequate adhesion .

2. Disconnect the cable from the power transistor to the coil packs,located at the front of the engine on the passenger side (2.). Disconnectthe plug with six wires coming out of it, one black and five red with assortedstripes. The black wire has a long loop coming out of the insulation, thisis for checking the timing on cylinder #1.

3. Cut back the black wire shield to expose the underlying wires (3.)andthen cut away the insulation on each wire for about 3/4". Stagger the cutsto reduce the risk of unwanted shorts between the wires and also to makea much neater job on the final wrap (4.).

4. Route the wires from the TPIA harness to close to the stripped wires,then cut the yellow ones to length. They should be of staggered lengthsto coincide with the exposed wires from step 3. Solder each yellow wireto one of the igniter wires, it doesn't matter which one goes to whichas the wires are equivalent. Using the brass u shaped wire clips providedwith the TPIA helps here.

5. Using electrical tape insulate each joint separately and then rewrapthe wires together.

6. Find a source of 12V IGN power. Nissan's source of power for allthe ignition coils comes from the ignition coil relay located in the relay/fusebox. It's located on the front driver side of the engine compartment. Nextto this box there is a brown connector, a large gray/white connector anda gray connector. Disconnect the gray/white connector in figure (5.)and expose about 3/4" of wire from the thick black cable (6.).

7. Run a new wire from close to the power transistor to the fuse boxconnector disconnected in step 6. Run this parallel with the other PTUwires across the front of the engine to get clearance from the fan, pulleysetc. Solder it into the black wire exposed in step 6. and insulate it (7.).Reconnect the gray/white connector.

8. Using a bullet connector (or similar electrical connector) join thewire from step 7. to the red wire from the TPIA harness. By using a bulletconnector its possible to disconnect the TPIA and all wires in front formaintenance reasons.

9. Insulate all the wires with electrical tape and tidy up everythingwith cable ties (8.). Find a suitable ground connector (I used thebracket on the Power Steering Reservoir which may not be the most idealwas the best option given we were rushed and didn't feel like drillinginto the body) (9.).

10. Reconnect the battery and give it a try.... hopefully the car willstart and the red light on the TPIA illuminates.