I am in the market for a new exhaust system, and as with everything else on this build….I know nothing. I stopped by the muffler shop here in Chattanooga, and the guy told me to do some googling and listen to the sounds of both Flowmaster and Magnaflow mufflers. So, here I go. I will keep you guys along for the ride. If you are using a sniper and going dual exhaust, there are some considerations.
The second video I found had both a 350 CC engine and a very similar setup to my engine, but they are really looking at racing mufflers, but still a pretty interesting video.
Current setup:
Don’t know which muffler I have… I’m not familiar with the pipes. I am not even sure if the muffler is fully open or if it is clogged.
Update:(10/03/2025)
I talked to some friends around town and got a couple recommendations for muffler, work and exhaust work. There’s a couple of muffler shops around town and the one that was most highly recommended was Midas. i’m gonna get her in today and get it looked at to see if I need to change up the exhaust to maybe dual exhaust and change the mufflers up check flow restriction. I’ll give an update later.
Update:
SNIPER Considerations:
Setting up a Holley Sniper 2 EFI system with a dual exhaust setup requires attention to several key components for proper function. The system can operate effectively with dual exhaust and a single wideband O2 (WBO2) sensor, as the Sniper 2 is designed to work with one sensor installed on either exhaust side. It is recommended to place the sensor on the side that is known to run leaner for more accurate tuning, although placement on either side is generally acceptable.
Proper placement of the O2 sensor in the exhaust system is critical for accurate readings. The sensor tip should be positioned downward at an angle of at least 10 degrees from horizontal to prevent condensation from collecting and potentially damaging the sensor. A bung and gasket are included with the Sniper 2 kit for mounting the O2 sensor, and adjustable clamps are provided to secure it to the exhaust tubing.
The system does not require a specific exhaust configuration, but it is sensitive to exhaust leaks. Leaks can cause the Sniper 2 to malfunction, leading to improper fuel delivery and potential issues like fuel dumping or backfiring. Ensuring a sealed exhaust system is essential for the system to learn and maintain proper air-fuel ratios.
Additionally, the Sniper 2 requires a stable signal from the engine’s coolant temperature sensor, which must be installed in a coolant passage (intake manifold or cylinder head) using the included 3/8″ MPT threaded sensor. The system also needs a reliable power source, a crank or cam trigger signal, and a functioning O2 sensor to enable closed-loop operation and proper tuning.
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