best exhaust system?

[Brett240]

gday guys,

the exhaust on my car is a 2 1/2 inch steam bent with one resonator and a straight through glasspack muffler. needless to say its louder than a jet plane

im looking for a system that has a similar flow capacity but is ALOT quieter, any suggestions?

[drunkenmaster]

centre straight through or centre offset straight through muffler?

I read a review where the genie tornoda muffler in centre offset congifguration was both one of the best flowing and quietest in the smaples tested, autospeed review i think it was.

[Brett240]

its an off set straight through, redback i think. would there be much difference in flow with a proper baffled muffler?

[drunkenmaster]

http://www.autospeed.com/cms/article.html?&A=0381&P=1

Apparently so, check out the results.

For my zed I am thinking about using a centre offset rear muffler such as the genie tornado and perhaps a centre straight through muffler midway, or perhaps another centre offset.

Another muffler is more desrved that a thinner resonator I think.

[sjcurtis]

I would say for quiet driving it is never ever going to be totally wisper stuff because of the cars design and where we all sit.

I will say for the quiet the under tail shaft flow thru is a must.

For the rear position, I normally got thru mufflers to get the right one at replacement time. Last change in Dec 02, I settled for the MERCURY glasspack 2 1/2 center in offset out. Nice around town, crisp in traffic, still gets loud above 4400 with power on.

cheers

Steve:classic:

[Brett240]

so having a straight through offset muffler under the tailshaft instead of a resonator will quiet things down?

[drunkenmaster]

Im basing that on my current car (4 cylinder). I got an EPA notice in the mail and I spent some time stuffing around with a baffled resonator, then 2 straight through resonators, adding a 2nd proper muffler was the only thing that made a big difference in the end.

[Brett240]

just got a quote from lambros hi-tech mufflers for a full 2.5 inche mandrel system with two hi-tech brand mufflers 880 AUS. they reckon they can keep it quiet while maintaining the flow of my current straight through system. what do you think?

[drunkenmaster]

Is that stainless? If so it sounds decent

Stainless mufflers ~$200 ea.

Stainless piping ~$450

Mild piping ~$250

HiTech are known to be expensive, and thats even in Melbourne where we dont have them

[Brett240]

yep , stainless from the extractors back, they use their own brand mufflers, i dont know how they can quiet a car right down while keeping the flow of a regular straight through system. ill give it a try, we'll see what happens.

[drunkenmaster]

Have a look at the mufflers first, any thing with baffles or ridges to absorb sound will harm your flow as you probably know.

[Alfadog]

Just a bit of a side question, why would you want stainless steel piping instead of mild steel??? Is there any real performance advantage?