not relative to the ground.......

Lets say the crank is a dot on a flat line.........
the "v" is situated on top of this line so that the two angles on either side have equal angles......in the case of the 4.0 60* V angle......which in turn means 60* outside angles......whereas on the 3.8 with a 90* means that the inside angle is 90* and the two outside angles when put together equal 90 (45*)
The upright "v is the pistons/rods or what make up the "v" of the engine.

The >< are the inside angles

-------------------------V
like this ____________>__.__<_______________


that is the base of the "v"

the 60 degrees simply describes the inside angle of the "v"

Relative to the ground if the inside angle of the "v" is 60 degrees then that means that the out side two angles >V< are also 60 degrees

Hopefully my illustrations helped a little.

 

I recently went from single GT takeoff (was on for over a year) to duals using an X. No gains, no losses as far as sotp difference. The only real difference is a 'stereo' sound, it's not louder except with the addition of the driver side piping you'll hear more of the exhaust, but it's not louder at all.

 

Sweet !!!
That's exactly what i'm looking for ....nice and mellow but good looking duals.....they flow well enough for decent gains with tune/CAI... and that is what i'm after.
Installed the GT muffler yesterday....and I'm very impressed.....I was expecting it to be much louder......and they aren;t which is nice...they sing a bit when stomped on and that's perfect for me right now!