DynoMax Performance Exhaust released a new 2008-09 Dodge Challenger SRT8 Hemi system (p/n 39484). DynoMax Performance Exhaust is manufactured and marketed by Tenneco Inc. Available now wherever performance exhaust products are sold, the DynoMax cat-back system posts an increase of 24 horsepower and 24-ft. lbs. of torque out of the Hemi Challenger. The powerful DynoMax cat-back features 409-grade stainless steel 3-in. intermediate pipes and tailpipes, providing protection against corrosion and permanent discoloration. The system is built around the DynoMax Ultra Flo Welded muffler  a 100-percent welded construction for improved durability and extended lifetime  supports flow up to 2,000 SCFM and 2,000 horsepower