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  • 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