Our Pro Tru line of pistons utilize a plasma moly pre-gapped ring for the budget minded consumer. Wiseco Sport compact kits include the high quality NPR XX rings, which are the best quality steel nitrided top rings and napier style 2nd rings. Our late model EFI lineup and several small block Chevy pistons are designed around the our 1.2mm Steel Nitride and napier GFX rings. Many of our big blocks utilize a .043 back cut top ring for extra material thickness around the intake valve.Fitment:2002 2006 ACURA RSX TYPE-S (K20A2;K20Z1)2004 2008 ACURA TSX (K24 & K24 w/ K20 Cylinder Head)2003 2007 HONDA ACCORD (K24A4;K24A8 K24 & K24 w/ K20 Cylinder Head)2002 2006 HONDA CR-V ALL (K24 & K24 w/ K20 Cylinder Head)1993 1996 HONDA PRELUDE (H23A1) 1993 2001 HONDA PRELUDE (H22A1;H22A4)2003 2011 HONDA ELEMENT (K24 & K24 w/ K20 Cylinder Head)2000 2009 HONDA S2000 (w/ 99mm K24 Crank)2000 2009 HONDA S20001991 2002 INFINITI G20 (w/ 92mm Stroker)2008 2014 MITSUBISHI LANCER EVOLUTION (GSR;EVOLUTION MR;EVOLUTION MR TOURING)1991 1999 NISSAN 180SX (SR20DET w/ 92mm Stroker)1995 1998 NISSAN 200SX (w/ 92mm Stroker)1995 1998 NISSAN 240SX 1989 1995 NISSAN BLUEBIRD (w/ 92mm Stroker)1991 1994 NISSAN PULSAR (w/ 92mm Stroker)1991 2001 NISSAN SENTRA (SR20DE w/ 92mm Stroker)1989 2002 NISSAN SILVIA (w/ 92mm Stroker)2002 2012 NISSAN SENTRA (QR25DE) 2005 2010 SCION TC1980 1982 TOYOTA COROLLA (w/ 63cc Head)