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The old muscle car system had a small H pipe about 1.5" on a twin 2". X Pipes sound like a single exhaust where an H Pipe retains the V8 thump more like straight dual with no crossover. A single 3" common in VN to VS with the old Holden V8 sounded much like an X pipe twin and high pitched on the top end. X pipe's a V8 Supercar note and H pipe's like a Sprintcar note as a reasonable description.Type of merge used. In my opinion a H pipe gives best note. I have a difillipo as they use a small H pipe.
systems using a X pipe will tend to sound smoother, whilst H pipe will have more traditional muscles car sound.
It depends on the brand, some sound like crap, some sound good. I have always promoted Manta as in my opinion they sound pretty damn nice. Some people don't like them, each to their own.What's the mild vs stainless argument on the newer LS ABBA? They still sound much more muscle car like the original LS? Or have they made design improvements to overcome the resonance the stainless creates?
Mums got defilippo 4-1's and a Manta pro twin 3" on her cammed vx. One of the only stainless I've liked.It depends on the brand, some sound like crap, some sound good. I have always promoted Manta as in my opinion they sound pretty damn nice. Some people don't like them, each to their own.
Mild steel has a better note than stainless and isn't quite as tinny sounding, but it's a very minor difference. Perforated tube mufflers packed with long strand fibreglass sound the best but the fibreglass burns out if the mufflers are too close to the engine. Stainless wool packing doesn't burn out and sounds good but it's a little louder than fibreglass for the same size muffler. Some cheap mufflers use a dense needle mat type fibreglass and don't sound the best. Mechanical chambered mufflers (no packing) sound the worst like the bi-modals, Flowmaster, Gonzo's etc, raspy awful noise. Note and noise level are 2 different things!Mild is a bit more mellow than stainless. If you use a quality glass packed muffler then they can sound pretty good.
A 2121 and 2441 was Lukey's single 2.5" system mufflers for a VB to VS. I used to run 1682's on HQ to HZ and they were 2" 8 x 4" and 16" long same design as the 2121. With no balance or H pipe, a 253 sounded like a 350 Chev with this combo. With HT/HG where the mufflers were under the front seats (further forward), we'd use 880's and they were 2" 5.5" x 3" 24" long straight through with a centre chamber and sounded great too.The best "old school" muffler is the L2121,