Got the rest of the Borla cat-back installed yesterday which sounds great, and I went ahead and asked the mechanic to drill weep holes while it was on the lift.
My Stang is a daily driver and he said water just poured out of them and left a huge puddle on the garage floor. Here I had read posts and seen videos about it, but didn't think I had any water in mine. Boy was I wrong, and I would highly suggest anyone else to drill.
I read a post somewhere stating that it does not void the axleback warranty, but don't quote me on it.
Does anyone know if this would apply to the FRPP Sport axle backs as well? Everyone says that they are the same as the Borla S types just re-branded for Ford Racing...
I would say it applies to all mufflers that don't already have a weep hole.
Mine had a solid pint of water in them after driving for a few months. I remembered to drill the weep hole after watching an exhaust vid I made and I could see the water spurting out the tips at WOT.
The FRPP muffler is made by Borla, but there are some internal differences. This was told to me by Borla when I inquired about this.
Drilling the hole will not void the warranty. Here are the instructions straight from Borla.
The only mufflers that won't really retain water are pure chambered designs like Flows. The packing in most other designs holds the water much longer. The water, BTW, is perfectly natural, being both condensation and a natural combustion byproduct. Modern cars produce quite a bit of water, so they need to run around an hour (of actual driving- not idling) to evaporate it from the exhaust. Mustangs are bad, too, with the mufflers at the back of the car, as it takes that much longer to heat them up.
Weep holes, kept to about 1/8" diameter, are fine in any muffler and are really helpful for short commutes and/or humid climates.
I think the key benefit is to keep water from sloshing around inside the mufflers, other than that the water accumulation doesn't really have any terrible affects on anything.
Some mufflers come with them, some don't. Mostly, it's a cost-saving thing for the manufacturer to not drill every unit. For our Mustangs, all the exhaust companies should include weep holes, but they don't. Ah, well, just another excuse to drive the car more!
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