What's the weight loss and power gain looking like?
lightening800 makes a very valid point in general about silencers.
The days of "opening up" a silencer and "flowing" more air to produce actual power gains are a thing of the past.
The engines, more than ever are tuned for a certain air flow with a certain fuel and ignition map.
IMO, you will find NO silencers that actually improve power and as pointed out above, many will cost power.
Often though, a different tone or loudness of the exhaust will give you impression of more power, which is natural... I felt the same way "back in the day" with the open exhaust or flowmasters on my '72 Nova 454 or the Honda elsinore that I pulled all the packing out of... but in reality, it was NO different in actual power.
During my tour of the SPG plant (others in the area to come)... I found that they are one of very few shops that actually flow tests the stock mufflers and matches that flow rate in their aftermarket silencers. They made the investment in the SF-600 Superflow bench to verify this with all designs.
If you are looking for a performance increase in your sled, don't believe the hype from anyone that the muffler will add power.
The main benefits of the silencer is weight savings, size and quality of construction...
The stock silencer from pre-production was around 11 lbs and I believe that this SPG unit sheds 4 lbs...
I will get exact numbers on the same scale with both stock and the SPG silencers and post them up.
I know everyone has a favorite silencer brand or sound, but in this day and age of computer controlled fuel systems... make sure that the company that has made the silencers you are interested in has done their homework and that they actually flow test their designs.
I look forward to seeing the other offerings that come out for this sled.
Heres a pic of the SPG flow bench in their shop... It gets a lot of use.
