Originally Posted by
ANDY black s13
changing from stock manifold to a tubular will change the sound,especially as you accelerate as the engine bay noise is increased
the stock thick walled mani acts as a sound insulator,a thin walled tube will emit more sound or noise
then the lay out of the manifold primary pipe lengths and design can alter the sound the exhaust emits out the back
HKS made a cast manifold for the TD06 and it gave the SR a unique rasp at higher revs
instead of a louder drone/resonance the stock manifold and similar equal length short runner manifolds give
a long runner unequal manifold on my 14a gave it a raspy sound similar to a honda vtec and lost a lot of the drone sound
depending on manifold alone the same cat back will sound very different,
elbows stock v's 3 " will increase sound levels
and down pipes 3" v's split 2.5" superlow types again changed the sound on mine slightly in lower rev range
imo to replicate a sound you like you will need run the same complete exhaust with manifold possibly turbo as well
even ceramic coating or header wrap can muffle sound/engine bay noise so the exhaust noise out back sounds louder in the car
titanium is a nice light material but known to crack after many heat cycles,bending it creates stress areas so why often it is pie sectioned at bends
it is not ideal for exhausts that get really hot like a turbo car, long term it can create cracks around welds
similar to aluminum for sound, louder than stainless at same gauge, and pie cut bends create a different sound
just some advise/my 2p on getting a certain sound you like