Had mine for almost 2 yrs........no problems yet........raised flange makes a gas tight seal....4 into one design seems sturdy. 0-60 performance just half car length shy of boxter "S" with my mods. Frank 93 SE-R Auto KYB GR-2's ST front and rear Sways Stillen Tower Strut Brace JWT POP and ECU HKS Cat Back Stillen 4-1 headers (new design) SP 8000 195X55X14 w/Stock Wheels