What are the best modifications you've done to your car?

[anomaly]

Be it an engine swap, tires or headlights, what do you feel are the best modifications you've done to your car?

[SLOroadster]

Mikuni's, an aluminum flywheel, the ported and polished cylinder head, and the mono-leaf springs. The springs have made everything else worth the effort.

Will

[spriso]

S15 SR20DE power of course!



Michael

[sleepyzzz]

Dave Briscos E1 Dizzy~~~~~~~~~~for sure

[23yrRebuild]

For the sake of brevity, I have removed comments regarding my upgrades from my previous list.

Aftermarket 4:1 headers
Removed the triangular inner panel near the starter for better access
Gear reduction starter
EI Distributor by Gary boone
3-core 2L radiator
Electric fan w/ adjustable thermostat
Gm "one-wire" chrome alternator
Halogen headlights
Air/Fuel Ratio gauge
Replaced early style "worm & peg" steering box with the later RCB box.
Front comp springs by Mike Young
Panasport 15x6 rims
Stroker R20 engine
5-speed roadster transmission
Speed bleeders on all brake & clutch cylinders
MG rearview mirror mounted to windshield strut

I pretty much favor all the mods equally, but if I had to pick, I'd say the EI Dizzy was probably the most dramatic improvement, and probably the best investment dollar-wise. The MG mirror is also a very useful upgrade for the low-windshield roadster and as another poster mentioned, the Speed-Bleeders are a good bang for the buck.
I like my ride....

[notoptoy]

First thing I did was add a Pertronix electronic ignition - made starting and driveability amazing. That was almost 20 years ago, when I had no money and knew nothing of a Boone or Brisco or any other Dizzie - I thought I was progressive and a genius. Not sure if I have a compelling reason to change now!
Next really want to get the 5-speed in, and am very interested in some type of carb swap out.
Tom

In re-thinking this, I have to say I got the car with mods, so they have to be noted:
H20 motor
Cibie Headlights
Momo Steering wheel
Enkei Wheels
Plastic engine fan

It came with 240Z seats -horrible - and I did add Miata seats, a major improvement!

[dridge11]

Only "mod" I've done was swapping to Hella H1's with Sylvania Silverstar bulbs which I'm quite happy with. I could barely see before and now it's like driving our Mazda3 with HIDs. MUCH better beam pattern.

Rota RBs and a 5 speed swap are next on my list.

[Linda]

Garry Boone dizzy made a big difference. MSD coil and wires. KYB G2 shocks. Momo steering wheel.

And Rareparts lower ball joints, of course!

Linda

[GeoffM]

EI Dizzy from Stan has made a huge improvement to my runability.

Other than the lighting upgrades, all the mods posted above are on my wish list that I am slowly picking through. I will have the rareparts LBJ's and Mike Young springs installed in the next couple of weeks.
I think I'm going to add the Mikuni HSR's to the list I'm keeping for the stroker I'm building.

[dridge11]

So I see a theme, El Dizzy is a good upgrade. Not something I'd really considered before cause my car seems to run just fine as is.

[shifty]

Another vote for the Boone/Brisco EI dizzy!

Other mods:
Hella H4 headlights and new wiring circuit to run headlights directly from the battery
GM alternator
Solex carbs
Yokohama AVS ES100 tires
Later Datsun radio with ipod input hack

[bobd]

Brisco Dizzy
electric fan
electric fuel pump
GM alternator
H4 headlights with wiring mod
forklift starter
Best labor saving mod? - SPEED BLEEDERS

Hopefully front springs in the near future

[ppeters914]

Gary Boone EI dizzy
GM alternator
Adding proper grounds

[DatsunDave]

Another vote for the Boone/Brisco EI dizzy!

Hella H4 headlights and new wiring circuit to run headlights directly from the battery

I didn't think these were DOT approved?

[dridge11]

Another vote for the Boone/Brisco EI dizzy!

Hella H4 headlights and new wiring circuit to run headlights directly from the battery

I didn't think these were DOT approved?

They aren't, but I don't think anyone is going to make a big fuss on a 40+ year old car. I don't know why they wouldn't be, the beam pattern is wonderful and I don't get people flashing me thinking I have my brights on.