Frequently Asked Questions About International ProStar Engine & Performance Parts

What engine options are compatible with International ProStar models, and which performance parts work with each?

International ProStar trucks primarily come with Cummins ISX15, ISX12, and MaxxForce engines depending on the model year. For 2008-2016 ProStars with ISX engines, most aftermarket turbochargers, exhaust manifolds, and EGR delete kits are compatible. MaxxForce-equipped models (2010-2015) require specific parts due to their unique emissions system. Always verify your engine serial number before ordering, as Cummins engines use different turbo configurations between pre-2013 and post-2013 models.

How difficult is it to install aftermarket exhaust systems and DPF delete pipes on a ProStar?

Installation typically takes 4-6 hours for experienced mechanics and requires basic hand tools plus a sawzall for removing factory components. The main challenges include accessing tight spaces near the transmission crossmember and properly supporting the exhaust during removal. Most aftermarket systems use factory hanger locations, but some 2010-2012 models may need modified brackets. Professional installation is recommended if you're unfamiliar with emissions components, as improper installation can trigger fault codes.

What are the real-world performance gains from upgrading turbochargers and tuning on ProStar engines?

Stock ISX15 engines typically see 50-80 HP gains with aftermarket turbos and proper tuning, while fuel economy improvements range from 0.5-1.5 MPG depending on driving conditions. Upgraded turbos like the BorgWarner S400 series provide better spool-up and reduced turbo lag, especially noticeable when pulling grades. However, gains vary significantly based on existing engine condition, and engines with over 500,000 miles may need internal work to fully benefit from performance upgrades.

Which aftermarket air intake systems actually fit ProStar engine compartments without modification?

The S&B Filters cold air intake and aFe Power Momentum HD systems are direct-fit options for 2008-2017 ProStars with ISX engines. These systems clear the hood and side panels without cutting or trimming. MaxxForce models have limited aftermarket options due to their unique air box design. Most universal intake systems require custom brackets or slight modifications to the factory air inlet tube, particularly on 2014+ models with updated engine covers.

What exhaust brake options work with ProStar automatic transmissions, and are they worth the investment?

Pacbrake and BD Diesel exhaust brakes are compatible with Eaton Fuller automated transmissions in ProStars, providing 60-80% of engine braking power compared to Jake brakes. Installation requires splicing into the transmission control module for automatic engagement. For trucks running mountain routes or heavy loads, exhaust brakes reduce brake wear significantly and pay for themselves within 50,000-100,000 miles. However, they're less effective above 2,000 RPM compared to traditional engine brakes, making them better suited for city driving than steep grade descents.