Custom duals to y pipe
No it doesn't. Auto manufacturers were downsizing tailpipes before he was born. He's no end all be all. The reason it was done is because of gaining more space for moving rear suspension parts. It doesn't unlock any "secret" power. I don't care who says it.
Sorry Rusty, Without getting Emotive, I'll have to disagree on your last sentence: Going to a smaller tailpipe on most daily OEM drivers can and DOES boost off-idle & low end torque.Period.
The OEM manufacturers, even WITH plently of non-interferance space, wouldn't have built them, without good reason, other than too of a byproduct you mention of quieting exhaust down.
I've had a lot of experience in l6 exhaust systems, both street & race (to the extent of building my own turbo mufflers from muffler manufacturers cases & Caps, before they were ever avail in New Zealand, like my Dad before me, making Glasspacks) & its been proven, in mild/many applications smaller is better.
Also case in point with these Cast Aussie hyperpack clones, I can tell you right now, from past experience before they were a twinkle in casters eye, that 90-95% of the Power increase comes from the SPLITTING of the 2 head pipes & there's a Magic # for the length, quite long for the Pair, 2" is best I learnt in the 70's & on a Dyno you run a pair of 2" pipes under & out the side with a stripe of enamel white house paint run down their lengths: where it stops burning, smoking & really changing color is the best merge point.
About 6'-8' ea depending on the Cam etc. For a 225" 2.25" dia anywhere in its system is more than enough or you loose flow velocity.. Same for the latest flowmaster type drone-boxs - a pair of suitably sized Glasspacks have proved their worth.
Australasia Grew up on hot worked 6's...
Been there, done that since making 2 stroke DG/FMF type 2 stroke expansion chambers as young teen ( cause you couldn't buy em) & hot tube pipes/mufflers for the 4 stroke bikes when a welding torch wasn't too heavy to hold & worn out std too expensive to repl. Etc.
You can run with your Big bores but some know better, all due respect given.
Thanks My friend.
