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borla faq



Q1. What is the difference between T304 and T409 Stainless?

T304 stainless steel will not oxidize or rust, it can however develop a golden color when exposed to high heat over time. T409 stainless steel has a fair amount of ferrous material in it and can show surface oxidization after some time, especially when exposed to road salt. This can be prevented by applying a stainless steel cleanser using a scouring pad. If you are concerned about long-term appearance, you should get the T304 system. If you are more concerned about the price, but want something that is more durable than aluminized steel, then the T409 system would be the system of choice.


Q2. What improvements can I expect in Torque, HP, and Temps?

While performance gains vary depending on the vehicle you can expect a gain of 5% to 10% in horsepower and torque. For example, with a 2005 Chevrolet Silverado with a Duramax diesel engine you will see a gain of 18 HP. and 28 ft/lbs measured at the rear wheels. You can also expect a reduction in exhaust gas temperature (EGT) by approx 200° F.


Q3. Is there a difference in performance between duals and single exhaust systems?

The performance gains are the same for duals and single systems. The duals offer a deeper more aggressive sound over the single system. This is due to the extra tail pipe and the fact that most dual systems have a slightly different muffler configuration than the single systems.


Q4. What does "off-road" mean?

An "Off-road" system is designed to deliver all out power gains. These systems make no provisions to retain the factory catalytic converter. Some jurisdictions do not allow the removal of your vehicle's catalytic converter therefore they can only be legally used off of the highways.


Q5. Will I be able to keep my spare tire in place if I get a "Cool Duals" system?

Generally, MBRP designs all of its systems to retain the factory spare tire. The only exception to this is the "Cool Duals" system for the Chev/GMC Colorado and Canyon (Part No. S5028AL, S5028304, S5030AL, S5030304).


Q6. Do your exhaust kits include all clamps and instructions?

Our kits come complete with all the required hardware as well as clear, easy to read instructions with lots of pictures to help you work your way through your installation.


Q7. Will your systems fit into a dually truck?

All of our exhaust systems will fit dual rear wheel (dually) trucks. We do recommend that tips be installed to extend the exhaust and avoid any discoloration of your vehicle.


Q8. What size is your exhaust?

For diesel vehicles we offer performance exhaust systems in 4" and 5" diameter pipe. Due to fitment issues some of the diesel systems come with a 3.5" down pipe. Our Performance Gas single systems use 3.5" tail pipes while the "Cool Duals" systems use 2.5" tail pipes. The front pipes on the MBRP Sport Truck systems vary from 2.5" to 3.5" depending on the size of the factory exhaust.

For diesel vehicles we offer performance exhaust systems in 4" and 5" diameter pipe. Due to fitment issues some of the diesel systems come with a 3.5" down pipe. Our Performance Gas single systems use 3.5" tail pipes while the "Cool Duals" systems use 2.5" tail pipes. The front pipes on the MBRP Sport Truck systems vary from 2.5" to 3.5" depending on the size of the factory exhaust.

All of the pipes are made from 14 and 16 gauge tubing.


Q9. Will the dual exhaust fit around my hitch?

All of our diesel exhaust systems will fit with factory installed trailer hitches as well as most aftermarket bolt on hitches. You may run into interference problems if you have a fifth wheel or gooseneck hitch installed. In that case we recommend installing a single system.


Q10. At what location does the exhaust tail pipe exit out on the truck?

All of our single exhaust systems, either for gas or diesel exit behind the passenger side rear wheel. Our "Cool Duals" for diesel trucks exit behind the rear wheels. We offer you a choice for "Cool Duals" on your gas powered trucks of either out the side exiting behind both rear wheels or straight out the back on both sides.


Q11. What exhaust tip is included with MBRP exhaust systems?

Our 4" Pro Series diesel systems come complete with dual walled angle tips. For the "Cool Duals" they are the angled T5053 and the single has a straight cut T5049. The XP and Installer Series have our T5051 angled rolled end tips. Our Performance Gas, Muscle car and Jeep exhaust have a variety of tip designs to suit the style and application. In all cases the tips are mirror polished T-304 stainless steel save for our Black series systems which have a coated black tip. Our 5" diesel, Performance series and PLM systems do not have a tip included nor do systems with a turn down tail.


Q12. Which way should I install the muffler?

The muffler on the single diesel exhaust systems should be installed to allow the exhaust gasses to flow smoothly over the louvers on the muffler core. If the muffler is installed so that the louvers catch the exhaust gases it will increase resonance levels inside the vehicle.


Q13. What warranties do I receive with MBRP exhausts?

• Pro Series (T-304 stainless steel) - Lifetime warranty.
• XP Series (T-409 stainless steel) - Lifetime warranty.
• Installer Series (Aluminized) - Three (3) years.
• Black Series - Three (3) years for the components; One (1) year for the coating.
• Performance and PLM Series - Two (2) years.

Remember: You MUST send your warranty card and a proof of purchase to MBRP to activate your warranty. All warranties are from the date of purchase.


Q14. Can I leave the catalytic converter in?

Yes, the catalytic converter can be retained for all current model trucks. Be sure you have purchased the correct system that will allow you to retain the converter.


Q15. What are the advantages of a MBRP exhaust compared to the stock?

By installing an MBRP exhaust system you will see an increase in horsepower and torque. Fuel mileage gains may be noticed as well as a decrease in exhaust gas temperatures (EGTs). By lowering EGTs you will increase your turbo longevity.


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