The most members online in one day was 424, 12-02-2013.
000, 16vrs, 1978dave, 1TJH, 1ukf, 2tsg, 360bhp-rs-turbo, 3dr-rally-slag, 800bhp, abes36, ablc, adam ant, adamescortcosworth, Adamski, adsrs1, AGAR, Agent David, AJC, all star 680 bhp, andy escos, Andy/wigwam, Andyescos, andyp71, anton rs, Ashie, a_smoked_haddock, b0bbyb0y, B13 JUS, B5rlr, Barney Gumble, BARS789, baz22, bazza-cossie, ben L, Ben Purnell, Bergcup435, big mike, bigholmes, bigpower, BLACKDUK69, bluebones, blueboy, brammer, buck1, bumblebeebok, c20tbo, C8sslcosworth, cab2cos, calv, Carlo, Carparts Express, chicksrs, Chocky, Chopper1981, CHRISP, chriswrc51, chunkrs, Cochyn, cookiemonster, cootsie, cosiedevil22b, cosmo, Cossie Brad, cossie dunc, cossieben, cossiedavid, cossiefrank, cossiemanden, Cossiemat, cossieprob, COSSYBLADE, cossymad, cossystevo, Cosworthfreak, coswurv, cosymex, cozzylee, Crofty, D J, D2CJB, Dan Le Moignan, Dan31, dan400, Danny, Danwood79, darkhorse, Darren, Dave H, Dave82, Davecos 4x4, daveocallaghan, Daveyboy, Dave_M, Daz 75, daz5885, deekp85, DELLBOY 1, dfp454, DMB Graphics, dobbie, dom123, Double-A, DrewWrc, driven7, Ducktin, dunccoss, Dwaynem001, e30matt, EASTWOOD250, ebonycossie4x4, ecosie, Elfranco, ESCORT2483, escossie, Escossie93, Escos_Matt, eyeballpaul, fasteddie, fernando, flat2demat, FletchCossie, Fluff1978, focus 4x4, ford-ish, fordrallycar, fordrs2005, fredrikj, frst silver, F_C, garet, GARY F, Gavin E-Cos, Gazg, german phil, Ginge, ginner81, GLEN, goldengraeme, gracos, Gray_rs, grcossie, HBS, Hex, hks, hrammurhrammur, hughy, i3lack0ut, iain, ian sibbert, ImpCossie, ital_cossie, j20rmc, jacko996, Jake, jamest8, Jandk, Jay P, jeg666, JHS, jimcallear, Joe-Tait, JohnP001, johnrst, johnyjn, jon@work, jona bona, JonL, Juan [Motelec], Jube, july1, K44ACE, Karlheinz, KERITYRES, kjc300, KR54321, ksa-cossie, L333nya, Lasse H, lee2cossies, LEECOS, leet, Leigh, Loader, luca, M K, M.Hansen, m10gt, m19rcj, m4rkl, mab1, manoj, Mark B, Mark Barber, Mark King, mark shead, markicp, markmc, marmiteRSlover, MATCOS, matt cullimore, matthewcrf, matti, Matty, MaxCos, maxest, maxturbo, mboon, Mechanicalrepairs, Mickeystewart, mickswfc, miggs cosworth, Mike W, mikedaf2, MK Motorsport, mk1 rst, mk2steve, mondeofreak, Monster, monte 066, more-boost, morpheous, myaRSe, Nash, nats, neo1, nick8saff, nikki.n.tom, nobbystocks, octainejunkee, oddkidd, ossie cossie, palmeros, Paps161, Paul Cos, paul222, paulg, Paulj1, Paulrs22, peternut, peterstewart85, petes_rs, phil clay, phil saunders, philmustang, philram, PKS, POLARIS ESCOS, postal_DK, psygnosis, PYE WHITE, Radiant Rob, Raffi, RaZoR, rberntse, Re Nero, redrsmk5, RICH2984, Richie, Richiers, richyx, RickS, Rippers, robocop, robski, Rolls, ronnie amis, RS 500 Registrar, RS Bowk, Rs fruitbat, rs slim, RS-Jo, RS974, rsbuz, RsJohnny1, rslubby, rsnissan, RST220, RSyoyo, rs_driver, Rs_Rob, RS_Saint, Ruudsengen, RWD_cossie_wil, scotram, scott-cos, Scouse, SCS j1mbo, seanyboy, SGRAY, sheerline, silvercos, silverrsc, Simon M, simonw, Sonic Boom, spiritof'76, stecozz, steelej, Steve Buck, steveboyslim, Steviec, steviecossie, StickerPaul, stinky, Stoo, strawny27, stu, swainy3, Tarmac Terrorist, tbs, The Radman, the youth, therebelsc, Thomps, timsrs, timster, Tkracing, tommi, Tore_TJ, TREVCOS, turbocat, turbokiller, turbom, turbomook, Turkish, twin turbo, twins, txaran, velesdarkay5790, Villacas, W44RKY, warrenpenalver, Wayne Ash, WENNY, Wesley P., wheely-boy, wicksee, woodywoodpecker, wozzy, wrcjim, Xelr8, xpackboy, xpower, yorkcity, zak cos

The most registrations in one day was 23, 19-12-2008.
2tsg, matthewcrf, velesdarkay5790

GARY F (32)