For your ease & reference:

Manufacturers & brand-specific links

Nissan
www.nissan.co.jp
www.nismo.co.jp
www.autech.co.jp

Subaru
www.subaru.co.jp
www.subaru-sti.co.jp
www.zerosports.co.jp
www.syms.jp
accessory.subaru.co.jp
www.sss.ne.jp/tokyo-subaru/index.htm
www.worksbell.co.jp

Mazda
www.mazda.co.jp
www.mazda.co.jp/mazdaspeed
www.rmagic.net
www.pac-gate.co.jp/feed
www.knightsports.co.jp
www.re-amemiya.co.jp
www.pac-gate.co.jp/run/
www.odula.com

Mitsubishi
www.mitsubishi-motors.co.jp/japan/
www.ralliart.co.jp

Honda
www.honda.co.jp
www.mugen-power.com
www.spoon.jp
www.hondatwincam.co.jp
www.pac-gate.co.jp/back-yd/index.htm (Backyard)
www.gt-rom.net
etcetera.jp (I's Impact)
www.uranus.dti.ne.jp/~sorcery/ (Sorcery)

Toyota
www.toyota.co.jp
www.toyota-ttc.co.jp (TRD)
www.tomsracing.co.jp
www.c-one.co.jp

Suzuki
www.suzuki.co.jp
www.suzukisport.com

Daihatsu
www.daihatsu.co.jp

Isuzu
www.isuzu.co.jp

Mitsuoka
www.mitsuoka-motor.com


Top Workshops & Companies
www.apexi.co.jp
www.hks-power.co.jp
www.blitz.co.jp
www.5zigen.co.jp
www.trust-power.com
www.fujitsubo.co.jp
www.bride-jp.com
www.junauto.co.jp
www.veilside.co.jp
www.mines-wave.com
www.trial.co.jp
www.tommykaira.com
www.topsecretjpn.com/


Other Workshops & Companies
www.uras.co.jp
www.saurus2000.co.jp (Garage Saurus)
www.rs-r.co.jp
www.signalauto.com
www.tomei-p.co.jp
arise-power.com
www.toda-racing.co.jp
www.racinggear.co.jp
www.sard.co.jp
www.border-racing.com
www.datasystem.co.jp
www.bozz.co.jp
www.emotion-r.co.jp
www3.ocn.ne.jp/~sheepdog
www.arcinter.co.jp (arc)
www.first-inc.co.jp (buddy club)
www.jsracing.co.jp
www.east-bear.co.jp
www.koyo-rad.co.jp
www.g-reckless.com
www.denso.co.jp
www.dogfightpro.com
www.napolex.co.jp
www.autoexe.co.jp
www.greatcompany.co.jp
www.night-pager.com
www.garagemak.com
www.works9.jp
www.jubiride.com
www.kenstyle.co.jp/
www.midoriseibi.co.jp/
www.runs.co.jp
www.ksp-eng.co.jp (attain)
www.impul.co.jp
www.weds.co.jp
www.kansaiss.co.jp (kansai service)
www.phenix-autocenter.co.jp (target)
www.phoenixs.co.jp (phoenix's power)
www.nagaidenshi.co.jp (ultra)
www.runner-sp.co.jp
www.hpiracing.co.jp
www.thrash.co.jp
www.dwest-web.com
www.carmate.co.jp (razo)
www.kakimotoracing.co.jp
www.zees.co.jp
www.yashiofactory.co.jp
www.lead-racing.com
www.calsonic.co.jp
www.makeup-power.co.jp
www.creative-sports.com
www.prodrive-japan.com
www.k-style.gr.jp
members.jcom.home.ne.jp/technical-factory-hirano1/01/index.htm
www.ms-factory.co.jp
www.kei-office.co.jp (not kei cars, despite the name)
www.ikeya-f.co.jp
www.yellowfactory.net
www.craftsquare.co.jp
www.luck.co.jp
www.monster-sport.com
www.auto-craft.jp
www.artfactory-inc.com (graphics)


Aeroparts etc - note: many of these companies in the following sections also make other parts - mechanical or otherwise
www.c-west.co.jp
www.drft.co.jp (also c-west)
www.wisesports.co.jp
www.ings-net.com
www.varis.co.jp
www.aerocraft.co.jp
www.alles-create.co.jp
www.damd.co.jp
www.ganador.co.jp
www.webersports.jp
www.aeropalace.co.jp
www.gialla.co.jp
www.do-luck.com
www.kazamaauto.co.jp
www.gpsports.co.jp
www.awa.or.jp/home/tanaka-t/ (devil)
www.aqua-fsp.com
www.t-and-e.co.jp (vertex)
www.ab-flug.co.jp
www.masamotorsports.com
www.abroad-limited-company.co.jp (D-Style)
www.bn-sports.co.jp
www.freeway-dolphin.co.jp
www.fabulous.co.jp
www.bomexaero.com
www.rd7000.com


Brakes/Suspension/Clutch
www.cusco.co.jp
www.oguraclutch.co.jp
www.endless-sport.co.jp
www.exedy.co.jp
www.tokico.co.jp
www.project-mu.co.jp
www.a-t-s.co.jp
www.tein.co.jp
www.rd-tanabe.com
www.kgm.co.jp
www.kyb.co.jp
www.jic-magic.co.jp
www.yrc.co.jp/yfc/gab
www.kaaz.co.jp


Wheels & Tyres
www.rayswheels.co.jp
www.hartwheels.co.jp
www.speedstar.co.jp
www.advan.com
www.arw.co.jp
www.bim-cs.com
www.bbs-japan.co.jp
www.enkei.co.jp
www.crimson-inc.co.jp


Gauges
www.nippon-seiki.co.jp/defi/
www.omorimeter.co.jp
www.the-pivot.co.jp/


Lights
www.raybrig.gr.jp
www.fet.co.jp
www.bellof.co.jp/


Parts Chains
www.autobacs.co.jp
www.upgarage.com
www.cockpit.co.jp


Car Sales & Auction
www.carciao.com
channel.goo.ne.jp/car/
autos.yahoo.co.jp/
www.isize.com/carsensor
www.carview.co.jp
www.tax.co.jp
www.kaizousha.com (buyer beware!)
www.zele-international.com
www.freed.gr.jp


Motorsport
www.jgtc.net
www.d1gp.co.jp
www.ebisu-circuit.com
www.fujispeedway.co.jp
www.jasc.or.jp (tsukuba circuit)
www.suzukacircuit.co.jp
www.central-circuit.jp
www.rallyjapan.jp


Autosalon
www.e-autosalon.net


Magazines
www.sun-a.com/option/ (option)
www.v-opt.co.jp (video option)
www.bestmotoring.jp/ (best motoring)
www.microbrain.org/CARBOY/ (carboy)
www.carstyling.co.jp
www.mag-x.com (mag x)
www.cargoods.gr.jp (cargoods)
www.sun-a.com (for various magazine/video subscriptions)
www.carmode.net/gtr/ (GTR magazine)
www.carmode.net/yv/index.php (Young Version)
www.carmode.net/vipstyle/index.php (VIP style)
www.sun-a.com/genroq (euros - ferrari etc, in japan)