{"product_id":"afe-apollo-gt-series-3-409-stainless-steel-cat-back-exhaust-w-2020-gm-2500-3500hd-v8-6-6l-l8t","title":"aFe Apollo GT Series Cat-Back Exhaust – 2020 GM 2500 \/ 3500HD 6.6L L8T","description":"\u003cp\u003e\u003cstrong\u003eaFe Apollo GT Series Cat-Back Exhaust – 2020 GM 2500 \/ 3500HD 6.6L L8T\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 numbers \u003cstrong\u003e49-44122-P, 49-44122-B\u003c\/strong\u003e for the 2020 GM 2500 \/ 3500HD 6.6L L8T.\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\u003eConfiguration Guide\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eTip Finish:\u003c\/strong\u003e Polished, Black. This selection changes the specified finish\/appearance; choose the option that matches the rest of the build.\u003c\/p\u003e\u003ch3\u003eFitment \u0026amp; Part Numbers\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e 2020 GM 2500 \/ 3500HD 6.6L L8T\u003cbr\u003e\u003cstrong\u003eaFe POWER part numbers:\u003c\/strong\u003e 49-44122-P, 49-44122-B\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 2020 GM 2500 \/ 3500HD 6.6L L8T, 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":"Polished","offer_id":50260507525370,"sku":"AFE49-44122-P","price":704.0,"currency_code":"USD","in_stock":true},{"title":"Black","offer_id":50260507558138,"sku":"AFE49-44122-B","price":773.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0325\/6352\/7739\/files\/d9575e47d58c62749b45e14a822b3be8.jpg?v=1783037710","url":"https:\/\/lgcracing.com\/products\/afe-apollo-gt-series-3-409-stainless-steel-cat-back-exhaust-w-2020-gm-2500-3500hd-v8-6-6l-l8t","provider":"Legacy Racing","version":"1.0","type":"link"}