{"product_id":"afe-08-13-bmw-e90-92-93-mach-force-xp-304-stainless-steel-v8-4-0l-w-cat-resonator","title":"aFe MACH FORCE-Xp Cat-Back Exhaust (With Resonators) – 2008–2013 BMW(E90\/E92\/E93) 4.0L Cat \u0026","description":"\u003cp\u003e\u003cstrong\u003eaFe MACH FORCE-Xp Cat-Back Exhaust (With Resonators) – 2008–2013 BMW(E90\/E92\/E93) 4.0L Cat \u0026amp;\u003c\/strong\u003e replace a factory exhaust section with a freer-flowing, mandrel-routed system that also changes the vehicle's sound and rear-end presentation. This listing is built around aFe POWER part number \u003cstrong\u003e49-36321-1\u003c\/strong\u003e for the 2008–2013 BMW(E90\/E92\/E93) 4.0L Cat \u0026amp;.\u003c\/p\u003e\u003cp\u003eaFe's performance exhaust systems are engineered around tubing diameter, bend quality, merge transitions, muffler\/resonator strategy, hanger placement and tip configuration. Those details determine not only restriction but also tone, volume, clearance and how well the system integrates with the chassis.\u003c\/p\u003e\u003ch3\u003eWhat This Means on the Car\u003c\/h3\u003e\u003cp\u003eAn exhaust should be selected for the complete use case. Larger tubing and lower restriction can support additional airflow, but sound character is equally important on a street car. Axle-back systems primarily change the rear section and sound; cat-back and larger upstream systems address more of the exhaust path.\u003c\/p\u003e\u003ch3\u003eFitment \u0026amp; Part Numbers\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e 2008–2013 BMW(E90\/E92\/E93) 4.0L Cat \u0026amp;\u003cbr\u003e\u003cstrong\u003eaFe POWER part number:\u003c\/strong\u003e 49-36321-1\u003c\/p\u003e\u003cp\u003eFitment can differ by engine, drivetrain, trim, factory equipment, emissions configuration and production date. Match the part number above to the vehicle before installation; where aFe publishes SKU-specific installation or emissions requirements, those requirements take precedence.\u003c\/p\u003e\u003ch3\u003eLegacy Racing Enthusiast Perspective\u003c\/h3\u003e\u003cp\u003eWe recommend deciding first how much additional sound you actually want, then choosing the system architecture. For track-capable street cars, we also consider local sound limits and whether a muffler\/resonator configuration leaves enough margin for future engine modifications. On the 2008–2013 BMW(E90\/E92\/E93) 4.0L Cat \u0026amp;, we would make the purchase decision around the limitation this component addresses and how it fits with the car's current and planned modifications.\u003c\/p\u003e","brand":"Legacy Racing","offers":[{"title":"Default Title","offer_id":50260916142330,"sku":"AFE49-36321-1","price":2238.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0325\/6352\/7739\/files\/01edb0b0b3ce198e212141592c37bee4.jpg?v=1745365135","url":"https:\/\/lgcracing.com\/products\/afe-08-13-bmw-e90-92-93-mach-force-xp-304-stainless-steel-v8-4-0l-w-cat-resonator","provider":"Legacy Racing","version":"1.0","type":"link"}