Diana Sirokai Plus Sized curvy model Instagram Plus size model Diana Invidia Titan G5 Titanium R400 Cat Back Exhaust. INVIDIA TITAN G5 CAT BACK EXHAUST Pure Sound. Pure Titanium. Utilising high quality, pure, heat resistant Grade 5 Titanium, the Invidia G5 Titan Exhaust systems ensure optimal strength and durability whilst keeping weight to a minimum. The G5 Titan systems are manufactured using state of the art mandrel bending machines to create one continuous piece with no lobster back bends for unrivalled exhaust gas flow. Carefully designed for maximum performance, it will do more than just meet your expectations. From start to finish the Invidia Exhaust Systems are designed with performance in mind with the exhaust route carefully selected to ensure minimal bends, allowing for an unobstructed exit of exhaust gases with minimal restrictions and turbulence. This will allow for improvements in both horsepower and torque, along with improvements in throttle response with a reduction in turbo lag for turbocharged vehicles. Additionally, you get the reward of an aggressive exhaust note.