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The MBRP exhaust mod is from the "cat back". The main performance improvement is changing out the stock cast iron header for a tuned exhaust headers. The stock mufflers are quite efficient.
In my opinion, the MBRP will only change the sound of the exhaust and add a dressy look at the tips.
The stock hp and torque for a 33 ft coach and no tow will be awesome. If you tow a 4000-5000 lb car or trailer you will notice a drastic drop in performance.
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Bill & dear wife Helen
Last of the Chieftains, 2004 39T, W22, UP tune, Banks, Koni's, Safe-T-Plus, SMI brake
2017 Lincoln MKZ Hybrid towed 4-down or my 2008 Jeep Wrangler JK
![https://www.irv2.com/attachments/signaturepics/sigpic23522_1.gif]](/attachments/signaturepics/sigpic23522_1.gif)
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Linear Mode
