Frequently Asked Questions About Peterbilt 359 Elbows, Piping & Comp.

What's the difference between chrome and stainless steel exhaust elbows for my Peterbilt 359?

Chrome-plated elbows offer a mirror-like finish and cost less upfront, but the chrome can peel or rust over time, especially in harsh weather conditions. Stainless steel elbows (304 or 409 grade) are more durable and resistant to corrosion, though they have a slightly duller appearance. For trucks exposed to road salt or frequent washing, stainless steel typically lasts 3-5 times longer than chrome. Most customers report chrome elbows need replacement every 2-3 years, while stainless can last 8-10 years with proper care.

Will these exhaust components fit my specific year Peterbilt 359?

Peterbilt 359 exhaust systems remained relatively consistent from 1967-1987, but there are important variations. Pre-1973 models often have different mounting brackets and pipe diameters (typically 5-inch) compared to later models (which commonly use 6-inch or 7-inch). Extended hood models may require longer intermediate pipes. Always verify your existing pipe diameter and measure the length from turbo to stack before ordering. If you're unsure, provide your truck's VIN or year when contacting us for the most accurate fitment guidance.

Can I install these exhaust elbows and pipes myself, or do I need a shop?

Most exhaust elbows and straight pipes can be installed with basic tools including pipe wrenches, band clamps, and penetrating oil for stubborn connections. The main challenges are dealing with seized clamps on old components and properly aligning multiple sections. Plan for 2-4 hours for a complete system replacement. You'll need jack stands to safely access underneath components. Professional installation typically costs $200-400 but ensures proper alignment and seal. Common DIY mistakes include over-tightening clamps (which can deform pipes) and inadequate support during assembly.

What wall thickness should I choose for my exhaust pipes?

Standard 16-gauge (.065" wall) pipes work well for most applications and offer a good balance of weight and durability. For heavy-duty use or if you're running higher exhaust temperatures, 14-gauge (.083" wall) provides extra longevity but adds weight and cost. Trucks with frequent short trips or excessive idling benefit from thicker walls as condensation causes internal corrosion. Many owner-operators prefer 14-gauge for longevity, while fleet trucks often use 16-gauge for cost savings.

Do aftermarket elbows and pipes affect my truck's performance or sound?

Quality aftermarket components matching OEM specifications won't negatively impact performance. However, diameter changes can affect exhaust flow and sound. Switching from 5-inch to 6-inch pipes typically deepens the exhaust note without hurting performance. Mandrel-bent elbows maintain consistent diameter through bends, providing better flow than crush-bent alternatives. Mitered elbows create more turbulence and a raspier sound compared to smooth radius bends. Most customers report no performance loss with proper sizing, and many appreciate the improved exhaust note from quality aftermarket systems.