Is this a good exhaust... opinions?

[PanthaVS]

I know it's probably covered before, but from what i've read in the past, this is probably what i'm looking for... just want clarification on sizes...

refer this diagram...



Are these the sizes i should go with?

After looking around (google searched and found this vid from another forum) this car has extractors, twin cats and a custom dual exhaust system... but it doesn't specify the exact setup and sizing...??
http://www.youtube.com/v/QnOrJjxB498&hl

I'm also interested in costing... from what i've found... ebay have magnaflow 2" cats for $125ea and mufflers are around the $70 mark and a rear resonator is probably around the same...

so totalling up, that would be $460 just for the parts (i already have the extractors) and that doesnt include the tubing, the tip and labour... getting expensive??

any/all input greatly appreciated..

oh... and also... does it sound nice in the vid? (for a V6)

EDIT: FYI - the outlet of the extractors (internal diameter) is 2"

[acarmody]

The only way you will get it to sound like that is to get Sureflo to make it. Its the mufflers that will determine the sound, and I believe Sureflo have thier own brand of them.

[GTP 85]

I've tried almost every combo possible on a v6 in search of the ideal allrounder: reasonable sound, minimal drone, simplicity of construction and performance.

A setup along the lines of the pic you posted is what i'd go for!

Pacemakers, twin 2.25 pipes, twin 2.25 cats, twin 2.25 straight thru mufflers, merge into single 2.5 pipe over the diff, single 5 inch straight thru barrel on the back. In theory it will keep the gas velocity up and keep it efficient.

As said muffler choice is important too. My personal preference is supercat glass packs or lukey ultra flows (approx $60ea). Middle mufflers must be glass packed, and rear barrel/ ressy (approx $60) must also be glass packed or else it will sound tinny.

For cats. put some Venom 200 cell metal cats. cheap yet reliable. can buy a pair on ebay for like $300 a pair

Will sound good for a v6 and be effective on performance too

Good luck, hope ive helped

[acarmody]

When you say 5" straight through barrel, do you mean just a huge resi?

I'm over loudish exhausts so on Monday I am have a new exhaust fitted. It will be Pacemakers, twin 2.5" cats, merge, single Hurricane glass packed through-muffler, rear huge Hurricane glass-packed resi, out, pipe is press-bent 2.5".

[PanthaVS]

I've tried almost every combo possible on a v6 in search of the ideal allrounder: reasonable sound, minimal drone, simplicity of construction and performance.

A setup along the lines of the pic you posted is what i'd go for!

Pacemakers, twin 2.25 pipes, twin 2.25 cats, twin 2.25 straight thru mufflers, merge into single 2.5 pipe over the diff, single 5 inch straight thru barrel on the back. In theory it will keep the gas velocity up and keep it efficient.

As said muffler choice is important too. My personal preference is supercat glass packs or lukey ultra flows (approx $60ea). Middle mufflers must be glass packed, and rear barrel/ ressy (approx $60) must also be glass packed or else it will sound tinny.

For cats. put some Venom 200 cell metal cats. cheap yet reliable. can buy a pair on ebay for like $300 a pair

Will sound good for a v6 and be effective on performance too

Good luck, hope ive helped

The outlet of the pacies is 2" ... unless its the outside diameter i should measure? please confirm? otherwise, i need to go UP to a 2-1/4" pipe straight out of the collectors... is that a good idea?

Also... what kind of pricing should i expect to get all these bits installed? (if i supplied all the parts to an exhaust shop)

[acarmody]

Well the shop would have to make the cat pipes, and then flange them for both ends, make the pipes to the mufflers, and then weld them in, weld up the hooks, maybe even a new hanger if you don't have twins up front, make both rear pipes (before and after rear muffler), and hang the rear muffler, and weld a merge in for the rear as well.

You would be much better off going into a store and asking them for a whole system price.

[PanthaVS]

You would be much better off going into a store and asking them for a whole system price.

good point... but it would still involve all the labour you listed... unless they have an "off the shelf" twin exhaust as i described??

[acarmody]

They probably won't, but they can at least source the stuff cheaper than you can.

[GTP 85]

When you say 5" straight through barrel, do you mean just a huge resi?

I'm over loudish exhausts so on Monday I am have a new exhaust fitted. It will be Pacemakers, twin 2.5" cats, merge, single Hurricane glass packed through-muffler, rear huge Hurricane glass-packed resi, out, pipe is press-bent 2.5".

yea 5inch ressy... whatevs, i call it a barrel lol. Its around 40 odd cm long, not big, just takes the drone off the note

[GTP 85]

The outlet of the pacies is 2" ... unless its the outside diameter i should measure? please confirm? otherwise, i need to go UP to a 2-1/4" pipe straight out of the collectors... is that a good idea?

Also... what kind of pricing should i expect to get all these bits installed? (if i supplied all the parts to an exhaust shop)

It wil be fine mate. on my race car (v6) i have the entry level pacies with the 2 inch flanges. then it goes out the 2.25's. hardly worth cutting a few inches off the collector cone to bring it out to 2.25 collector. i mite do it one day, but not important. I'm making stacks of grunt as it is.

You will pay more to get a custom exhaust pieced together, but i'm talking 'ideal exhuaust' for v6 here so investing a bit more to get the right thing done is worth it.

There will be nothing, that is bolt on, that is remotely similar to that pic u put up

[PanthaVS]

It wil be fine mate. on my race car (v6) i have the entry level pacies with the 2 inch flanges. then it goes out the 2.25's. hardly worth cutting a few inches off the collector cone to bring it out to 2.25 collector. i mite do it one day, but not important.

ok. so just have a very short length of pipe from the pacies to the cats that goes from 2" to 2.25"?

in which case, say the length of pipe between the pacies and the cats was 1ft long... would i:

1. have that length of pipe 2" diameter for the whole length with an enlarger at the cat end.. OR ...
2. have that length of pipe 2.25" diameter for the whole length with an enlarger at the pacies end.
(see below)



My question with this is... which is better for flow?

thinking about it myself,

Option 1 seems to be the ideal setup, my reasoning is that, the small diameter pipe retains exhaust gas velocity as it exits the collector, (To aid in scavenging) and then while it slows down to go through the converter, the larger diameter will have less restriction to the gases as they flow through the cat's "honeycomb" insides.

Option 2 seems like the short restriction would be taking away any possibilities of scavenging???

Thoughts????????????

[Not_An_Abba_Fan]

Exhaust travels down the pipe in pulses, not one continuous flow. Each pulse aids in the scavenging effect for the pulse behind it. Properly tuned extractors will have each pulse arriving at the collector ( or merge ) at even intervals so as not to interfere with any pulse either before or after it. Too large a pipe after the collector and the pulse will slow down and cause the next pulse to crash into it resulting in back pressure. Too small a pipe and it will be restrictive, also resulting in back pressure.

But, depending on where in the rev range you want your available torque will determine the size of the pipes exiting the extractors and the size of the rest of the exhaust system. It is a balancing act on the part of manufacturers to try and get it right for the majority of users. That is why there are limited options available for off the shelf products. It would cost too much to have products that met different criteria.

A custom made system is the best as long as it is correctly made to your needs. There are too many variables in every day street driving to get the perfect system, that is why manufacturers only make systems that mske vehicles louder as that is what the majority of people want.