Meallbhan

iTrader: (3)

Just wondering what difference is sound/noise there is if the centre section of the exhaust is de-resonated. Is it really noticable in volume?

Wurzel

iTrader: (1)

Yes!!! unresonated is offensive.

redwards

iTrader: (6)

Fitted unresonated to my 04 STi and the system is a little louder, you seem to hear it more in the cabin though.

GC8

Large

t.archer

A pal of mine fitted stainless centre section to his 2005 sti and we couldn't tell the difference - inside or out!

Mikkel

On a hawkeye it makes quite a difference.

Aberdeen Al

iTrader: (1)

Anyone got a sound or video clip of one on a Hawkeye?

I'm torn between the TSL and Revolution at the mo!

Cheers

53

iTrader: (41)

If its just the 2.5" OEM replacement centre pipe with a resonator delete, go with the cheapest out of the known brands such as TSL, Revolution, H&S, afterburner etc etc. As a single exhaust part they are all much of a muchness and have little impact on the sound of the exhaust more the volume. You also get a sense through the accelerator that the car is revving more freely.

Hawkeye STI, from front to back H&S Sports cat DP/decat/de-res/STi Back Box YouTube - STI Exhaust

Hawkeye STI, from front to back H&S Sports cat DP/decat/de-res/Blitz NurspecS YouTube - Blitz Nur-Spec S

Blobeye WRX from front to back OEM DP/Prodrive decat/OEM Centre/Prodrive Back Box YouTube - WRX

Blobeye WRX from front to back H&S Sports cat DP/Prodrive decat/de-res Centre/H&S Back Box Included in clip above

Aberdeen Al

iTrader: (1)

Spot on cheers!

53

iTrader: (41)

Pleasure mate

Wurzel

iTrader: (1)

I had a 2.4" unresonated decat mid pipe on my classic along with a decat SS downpipe and T75 backbox and you could hear me coming for miles, it was incredibly loud and horrible, plus teh throbbing noise inthe cabin was aweful aswell I swapped the middle pipe for a resonated prodrive PPP pipe and the difference was enourmous and much more pleasent note.

Meallbhan

iTrader: (3)

Cheers for the replies. So would it make a difference with a remap? Power wise I mean. Like taking the CAT/s out makes it freer revving etc, I take it a resonated pipe although quieter would cause some restriction. But how much? Anyone know in hp terms?

53

iTrader: (41)

Minimal/zero performance but it does feel easier through the accelerator. I found 2nd gear pull away less labouring for example post change.

I wouldn't compare resonator removal on a newage to a classic as the classic exhaust is far louder even when you are messing about with different back boxes. Whilst it makes a positive difference its far less impacting in terms of noise when removing on a newage to a classic.

daz1968

iTrader: (13)

I have a decatted up pipe, sports cat down pipe, ppp decat centre pipe with a H&S de res centre and a prodrive backbox on a 03WRX and it is not to loud at all, I think it is the backbox mainly that dictates the noise and the ppp box on my set up sounds about right.

Meallbhan

iTrader: (3)

Thats exactly the set-up I'm after once I get shot of my Revolution system. Reason for the questions is that where I stay there is a tw*t of a copper who hates scoobys and is doing as many as he can, so whilst trying to get the best out of the car, I want to make it as quiet as possible. Thinking putting a resonated centre in may make it that wee bitty quieter and with the prodrive box it won't look too large. Exit pipe that is.

53

iTrader: (41)

If you want a resonated section (I have one), try and get a MY06 STi/WRX one as the silencer part is larger.

Meallbhan

iTrader: (3)

Cheers mate, I think I have one too but not sure. I got a standard STI back box and a centre section of an 04 I think, a while ago just incase I was forced to swap it cos of the a-hole copper. The centre part might be stainless but I'm not sure and has 2 silencer looking things on it. I try and put a pic up of it later today to show you.

Steve_PPP

iTrader: (3)

exactly that

Fitted a de-res section to my PPP system and its slightly louder outside on idle, and quite a bit louder inside.

Great for me because i've only got a ppp box, but i imagine it would give you a headache on long journeys with something like a nur spec

Norman Dog

iTrader: (1)

New_scooby_04

iTrader: (4)

I've had both and though the sound from the outside with the unresonated section was lovely, inside the car, you got this really annoying drone and noise levels at a cruise on the motorway rose dramatically.

If you use the car regularly, would strongly suggest resonated!!!!

Ns04

Meallbhan

iTrader: (3)

lol, very good!

53WRX, here's the photos of what I have in the shed. An oem STI box and what I think is an oem centre (resonated). Am I right?



I am away on holiday as of tonight at 12 for 2 weeks, I'll check the thread before I go but please keep the answers/opinions coming as all are appreciated.

Jonny.

53

iTrader: (41)

Yes, looks like you have the cat pipe too ?

Meallbhan

iTrader: (3)

Oh, so does the bit on the left split and come off then? So the pipe would come in two. I thought the cat pipe fitted on after this. I'll need to have a closer look when I get back.