This guide is intended solely to assist you in making the best possible choice to remain Check Engine Light (CEL) free without requiring a tune. While the high-quality converters we use significantly reduce the risk of triggering a CEL, no aftermarket converter can guarantee complete prevention due to differences in factory calibrations, sensor behaviors, and vehicle conditions.
We have carefully preselected catalysts that we believe offer the best performance and compatibility for each platform. When comparing our products to others, please note that we clearly specify the catalyst size — and we use the largest size possible within the available space to optimize flow and function.
This list is regularly updated to reflect the latest data and product offerings.
Acura
NSX – HJS 130mm, Gesi GEN2 5”
Alfa Romeo
Giulia QV – HJS 130mm, Gesi GEN2 5”
Stelvio QV – HJS 130mm, Gesi GEN2 5”
Aston Martin
DB11 4.0 – HJS 130mm, Gesi GEN2 5”
Vantage 4.0 – HJS 130mm, Gesi GEN2 5”
Audi
B9/B9.5 S4/S5/SQ5 – Gesi GEN2 6”
B9/B9.5 RS4/RS5 – Gesi GEN2 5”
C7/C7.5/D4/D4.5 4.0t – HJS 121mm, Gesi GEN2 4.5”
C8/C8.6 A6/A7 – Gesi GEN2 6”
C8/D5 RS6/RS7/S8 – HJS 143mm, Gesi GEN2 6”
4M/4M.5 Q7/Q8 E839 3.0t Single Turbo – Gesi GEN2 6”
RSQ8/SQ8/SQ7 – HJS 143mm, Gesi GEN2 6”
Bentley
Bentayga 4.0L – HJS 143mm, Gesi GEN2 6”
Continental GT/GT Speed – HJS 130mm
Flying Spur/Flying Spur Speed – HJS 130mm
BMW
B58N/B58X – HJS 143mm, Gesi GEN2 6”
F80 M3/M4 – HJS 121mm, Gesi GEN2 4.5”
G80 M3/M4 – HJS 121mm, Gesi GEN2 4.5”
X3M/X4M – HJS 121mm, Gesi GEN2 4.5”
F10 M5/M6 F12/F13/F06 – HJS 121mm, Gesi GEN2 4.5”
F90 M5 – HJS 130mm, Gesi GEN2 5”
G90 M5 – HJS 130mm
E70/71 X5M/X6M – HJS 121mm, Gesi GEN2 4.5”
F85/86 X5M/X6M – HJS 130mm, Gesi GEN2 5”
F95/96 X5M/X6M – HJS 130mm, Gesi GEN2 5”
F9X M8 – HJS 130mm, Gesi GEN2 5”
M50i/S63 – HJS 130mm, Gesi GEN2 5”
M60i/S68 – HJS 130mm
Ferrari
296GTB – HJS 143mm
F8 Tributo – HJS 130mm, Gesi GEN2 5”
F12/812 – HJS 143mm
Purosangue – HJS 143mm
488 – HJS 130mm, Gesi GEN2 5”
SF90 – HJS 130mm
Lamborghini
Aventador – HJS 121mm
Urus – HJS 143mm, Gesi GEN2 6”
Lotus
Emira I4 – HJS 130mm, Gesi GEN2 5”
McLaren
570/540/650/675/MP4-12C – HJS 130mm, Gesi GEN2 5”
GT/GTS – HJS 130mm, Gesi GEN2 5”
720S/750S/765LT/Senna – HJS 130mm, Gesi GEN2 5”
Mercedes
M133 – HJS 121mm, Gesi GEN2 4.5”
M139 – HJS 130mm, Gesi GEN2 5”
M139L – HJS 143mm, Gesi GEN2 5”
M157 – HJS 130mm, Gesi GEN2 5”
M176/177/178 – HJS 130mm, Gesi GEN2 5”
M256 – HJS 143mm, Gesi GEN2 6”
M276 – HJS 121mm, Gesi GEN2 4.5”
M278 – HJS 121mm, Gesi GEN2 4.5”
Porsche
997/991 Turbo – HJS 130mm, Gesi GEN2 5”
991 GT2RS – HJS 143mm
992 Carrera – HJS 143mm
992 Turbo – HJS 143mm
Cayenne E839 3.0t Single Turbo – Gesi GEN2 6”
Cayenne Turbo/GT/S 4.0L – HJS 143mm, Gesi GEN2 6”
971 Panamera 4.0 – HJS 130mm
976 Panamera 4.0 – HJS 130mm
Range Rover
P530/SV 4.4L – HJS 130mm