Posted 2013-03-20 12:19 AM (#5477) Subject: Strait Pipe??
Posts: 1
I have a 98 Cummins Turbo Diesel. Empty it get about 26-28 mpg, towing about 20-22. My friend wants to put a Strait Pipe on it..says it will get even better mileage. Is this true? And what are some good/bad things about strait pipes?
Posted 2013-03-26 1:38 PM (#5478 - in reply to #5477) Subject: RE: Strait Pipe??
Posts: 15
What you are getting mpg is excellent mpg. Let him straight pipe the mighty cummins and you will regret it. You have your truck to pull with. I don't think you bought it to ride around in.
Posted 2025-03-29 2:42 AM (#9953 - in reply to #5477) Subject: RE: Strait Pipe??
Posts: 10
Location: Danaburgh
Installing a straight pipe on your 1998 Cummins Turbo Diesel can have both pros and cons, and whether it improves fuel mileage can depend on several factors. Here’s a breakdown:
### Potential Benefits of a Straight Pipe:
1. **Increased Exhaust Flow**: A straight pipe can improve exhaust flow compared to a stock muffler. This can lead to better turbo spool-up and potentially more power, which could potentially improve fuel economy under certain driving conditions.
2. **Weight Savings**: Removing the muffler can reduce the overall weight of the exhaust system, which might contribute to slight improvements in fuel efficiency.
3. **Performance Gains**: Some users report a modest increase in horsepower and torque, particularly if you modify the air intake or other aspects of the engine to complement the new exhaust system.
4. **Sound**: Many enthusiasts enjoy the aggressive sound of a straight-piped diesel, which can enhance the driving experience.
### Potential Downsides of a Straight Pipe:
1. **Fuel Economy**: While some claim better mileage, others find that the lack of back pressure can lead to a decrease in fuel economy, especially during low-load driving conditions. The actual impact on mileage
Posted 2025-03-31 6:54 PM (#9967 - in reply to #5477) Subject: RE: Strait Pipe??
Posts: 5
Possibly, but not always. Removing restrictions in the exhaust system can reduce backpressure, which may improve engine efficiency slightly. However, your Cummins is already a turbocharged diesel, and the factory exhaust isn’t overly restrictive. Any gains would likely be minimal (1-2 MPG at best).
Strait Pipe??
