VF2 Redline exhaust mods

[JimmyXR6T04]

hey guys,

Haven't been on the forum for quite some time, but need some advice for my redline and couldn't think of a better place! Picked up a redline a few months ago, and recently replaced the mid section of exhaust with a 2.5" system. Was hoping it would be louder/deeper, but it hasn't really had the desired affect.

Kept the stock rear mufflers on, but thinking I might need to replace those. I don't want any drone though.

So, what's my best option from here? bite the bullet and get a reputable 3" cat back system, or have the sports mufflers from the 2.5" system fitted? Seems like the stock mufflers are the major restriction when it comes to volume.

As much as i'd love to go all out and do full exhaust, tune, cams etc... I won't be (at this stage), famous last words.... I have a GT 335 that is ballistic enough :burnout:

For those with 2.5" systems, are you happy with the change over stock system? I must admit, the stock system is one of the nicest sounding exhausts I've heard. I'm assuming a 3" system is more likely to drone over a 2.5?

Any advice welcome!

Cheers,
Jimmy

[jaykay]

I would say if you ARE NOT going cam or FI in the future stick with a reputable 2.5" system.

[white lie]

Have you done anything about the bimodal? Otherwise it be be open at idle then closed until 3000RPM making it a lot quieter. Turn the car on, set it to open then pull the fuse/relay so it can't shut again. See if you like it...most people say there's no increase in drone with them permanently open.

Otherwise a catback twin system from DiFilippo or Manta are no brainers. Good sounding with no drone. I prefer the note a 3" system gives and I wouldn't say you get more drone with it.

[JimmyXR6T04]

I highly doubt I'll ever cam it... but, never say never...

I pulled the relay for the bi modal as soon as I got it home haha.

The new mid section is noticeably louder in the cabin, I wouldn't say it drones but it's certainly louder. Makes me worry that changing rear mufflers will drone. I wonder if I can purchase manta rear mufflers on their own...

Unless I just keep it as is for now, and see how I go with any future mods down the track. Can't go too hectic, as it's the wife's daily...

I thought changing mid section would give me the result I was after, I changed my middle muffler to a magnaflow on my Y62 patrol and it made a massive difference. Was sort of hoping the SS would be similar... In hindsight, I should have just gone a full manta or di Filippo cat back straight away.

[BLACKVE]

Change system, I did headers cats with standard system and sounded average, kpm 3" system and sweet deep note and tuned the horrible Holden pop crackles out

[JimmyXR6T04]

BlackVE - any drone/boom with KPM system? have the header back system on my GT and there's noticeable drone/boom, but only for like 200-300rpm. Not really any issue, as it's not as though I sit in that rev range often. Any drone/boom and it'll be an issue as the daily for the wife.

KPM is so damn exxy though.... trying to get out of this cheap lol.

[Micks]

Had a close look at my bi modal rear cans & they appear to have perforations prior to the valves. I think this is a cause of unwanted crackle & pop!

[JimmyXR6T04]

I actually don't mind the crackle and pop on downshift, but I know not everyone likes it.

[BLACKVE]

BlackVE - any drone/boom with KPM system? have the header back system on my GT and there's noticeable drone/boom, but only for like 200-300rpm. Not really any issue, as it's not as though I sit in that rev range often. Any drone/boom and it'll be an issue as the daily for the wife.

KPM is so damn exxy though.... trying to get out of this cheap lol.

I've got 2 kpm systems both 3", first system brought when that had 10% off sale, one on my VF2 was a bargain $750 2nd hand off a vf1 that had done 20k. Guy returning to stock.Mines manual no drone

[Lasoya]

Pacemaker Tuned Headers with high flow cats into 3" Manta twin stainless steel cat back is what i have on my VF2 Redline. Sounds bloody nice cruising and even better under full song. Jump on Facebook mate and join up to the group "Club VF Australia". Alot of guys on there have stock system but just change a mid pipe and makes it loud etc, cant remember what they are called

[Wonky]

I've had 3 KPM 3" full systems and all are/were great!! The SLC system on the Senator was on the car when I bought it and still sounds good (I've had a number of people ask what it was so they could buy) but IMO not quite as nice as the genuine KPM/Exhaust Technology non SLC systems. All on A6s (SSV sedan, SSV ute and now the Senator) - all no drone.

[JimmyXR6T04]

Thanks guys -

I've been looking for a second hand manta/KPM or Di Filippo, but they're not very common on the second hand market!

Lasoya - I just requested to join that page, i'll have a search and see what I can find. I guess I assumed that removing the centre muffler and replacing with 2.5' system with hotdogs would make a bigger change to the note than it actually did.

Wonky - thanks for the info mate, good to hear that no drone on the KPM systems. I have a the KPM header back on my GT335 and there is a touch of drone, but not too bad. Hence, why I was a little nervous forking out so much on a KPM for the Redline. I'll keep an eye out for a reputable second hand system in the mean time.

[Wonky]

Videos of my full KPM 3" with A6

The most it "droned" was up a slight rise on the Monash Fwy outbound just after Warrigal Rd - here's a clip.

https://www.youtube.com/watch?v=xx9vu0S_Ejw

[Wonky]

Another clip showing how loud under full acceleration but how quiet cruising - plenty more samples if you want to PM me.

https://www.youtube.com/watch?v=HROcI11qn0s

[whitels1ss]

Get headers, hi flow cats (perhaps an OTR) & a tune as well Jimmy.



I reckon it's well worth the extra coin. :yup:

[missmyv8]

Having gone through 5 exhaust systems on mine, my advice is don't skimp on the price, you get what you pay for, I started with 3" with headers, sounded tough as but the drone killed me. Ended up with 2.5 and HSV rear mufflers. Headers make a huge difference, much deeper note. Mine was a an auto wagon which are a lot more sensitive to drone. Around 2000rpm

[whitels1ss]

Having gone through 5 exhaust systems on mine, my advice is don't skimp on the price, you get what you pay for,
I started with 3" with headers, sounded tough as but the drone killed me.

That's a common 3" thing mate, especially on a wagon

even the most expensive 3" systems on the market have been known to drone. :yup:

[BLACK 346]

That's a common 3" thing mate, especially on a wagon

even the most expensive 3" systems on the market have been known to drone. :yup:

Yep, I have the ET twin 3 inch (aka KPM Streetfighter), it is mated to a pair of their 100cpi cats and 1 7/8 Hurricane 4-1's. Still drones a bit at certain revs. Sounds killer though,
as Wonky can attest to ;)

[whitels1ss]

Yep, I have the ET twin 3 inch (aka KPM Streetfighter), it is mated to a pair of their 100cpi cats and 1 7/8 Hurricane 4-1's.
Still drones a bit at certain revs.
Sounds killer though, as Wonky can attest to ;)

IMHO they all seem to drone more just with a cat back fitted

rather than when they are fitted as a complete system with a set of headers & decent cats.

[rodders188]

I have a difillipo big boy system on my cam only VE SS Sedan, cant attest for a wagon as everyone reakons 2.5'' but personally think 3'' have a better deeper sound. The Di Fillipo is really quiet inside the car at all rpm, no drone at all , if the car is daily drive ect this system is perfect, doesn't annoy any one. I can say the rear mufflers play a big part on noise , drone and note. I recently had magnaflow 3'' Oval 6'' mufflers jigged up to bolt on/off, to replace the di fillipos for abit more sound. The sound is incredible but quite loud outside and inside, some drone under 1800 rpm. Some say Varex xforce system is quite good also as can flip the switch to loud or standard quiet.

[JimmyXR6T04]

Thanks for all the info guys.

Would love to go a full system, tune etc... But not just yet. I think for the time being, I'm pretty satisfied with the note after replacing the centre section with a 2.5" system and maintaining the stock rear mufflers.

Thought I might try the rapid muffler J pipes on the rear for a bit more volume as they're not supposed to drone. Not sure if it'll still be the case noting I've changed my middle section.

Given it's primarily the wife's daily, and she's quite sensitive to drone and it being too loud in the cabin, I think I've found a decent compromise at present. Maybe headers/cats and tune and leave stock rear mufflers on will satisfy me a little more, but keep the volume suitable for her...