Dynomax's Race Bullet mufflers feature 100% welded construction for maximum durability. The Race magnum mufflers are available in aluminized or 409S stainless steel materials for long life and great looks. High-temp ceramic packing constructed around a perforated straight-through core. Perfect for all racing classes or any high horsepower street machine. Delivers that aggressive, powerful, deep performance sound and high flow that Dynomax is known for. Choose the size that's right for you!