Exhaust System For Mi16?

[daveyboyblack 1]

Hi All,

 

Hoping that sometime soon i'll be able to actually help someone on this forum, but for now I have another question

 

Currently on my mi'd 205 i've got the original 405 exhaust manifold, a grpN middle section (no box) and a janspeed back box.

As you can imagine, it's bloody loud (especially with no interior in the car) so I need to get something that's more suitable especially for trackdays, but also for road driving.

Also, i'm sure it's not making enough backpressure as it's a bit lacking in low down grunt comapred to others i've driven.

 

The grpN middle section has been cut at the back end in order to squeeze the back box on so I think i'm just going to start again with a full system, with a middle box as well as a new backbox. (Although I may be able to get away with keeping the backbox)

 

Can anyone recommend one that they've been using? I've been looking at an OMP 2-box system for about £200ish?

Should I just put an original 205 system back on, or am I right in presuming this will this be a little too restrictive for the engine? I'm not too fussed about looks, although i'd prefer an exhaust that I can see rather than being hidden. However main criteria are:

 

Noise that's low enough for trackdays (and also doesn't make the car sounds too chavvy)

Not overly expensive

Suited to the mi engine in terms of backpressure etc.

 

Anyone here with any systems they've used and had good experience with?

 

Replies are very much appreciated!

 

Cheers

Dave

[danpug 1]

I'd go for standard system if i was you, thats what i ran on my mi16 before i got tb's for it. Wasn't loud, looked discreet and definitely didn't restrict power.

[GLPoomobile 958]

If you think yours is loud, try an Mi with mild steel group N system with a massive split in the middle section. I drove mine from Falmouth to just past Exeter like that and the drone was not pleasant!

 

As above, the standard system should not be restrictive if you are using the correct parts (Bosal) rather than cheap pattern parts. Maxi has proven that even above standard Mi power by some margin it's fine (think he was getting about 216bhp from his last engine running a standard system).

 

Quite a few people on here have used the Omp Group N and I think the feedback is mixed. I've read comments about it not being very well made (but I'd have thought that was par for the course for an Omp product at the price they sell them for). Bennet was selling his recently and stated that is was not a very loud system (on his Mi) but it's all subjective unfortunately.

 

I'll be buying a DES stainless steel group N in the new year for my Mi, which is just shy of £300 if you include the shipping cost.

[ORB 227 1 Cars]

I have the MI 8 Branch manifold, into a mongoose stainless full system.

 

The tail pipe looks gay, but the zorst works well and it is not too loud.

[Miles 331 1 Cars]

A std phase 2 system is fine for a std power car, It's the 2 part one and needs the centre split in it, Nice thing about them is it's a 2" dia as std where the phase 1's and Group 'N's are smaller than this

[maxi 36 1 Cars]

A std phase 2 system is fine for a std power car, It's the 2 part one and needs the centre split in it, Nice thing about them is it's a 2" dia as std where the phase 1's and Group 'N's are smaller than this

 

 

Ive always made more power and various tuners have agreed with me with a Bosal system with no center split in the downpipe. My last engine made in excess of 216bhp and 174Ibft torque with a standard brand new bosal from the local factors. All these "go-fast" systems seem a bit of a waste of money to me and I have proven that.

 

Maxi

[John_B 11]

Ive always made more power and various tuners have agreed with me with a Bosal system with no center split in the downpipe. My last engine made in excess of 216bhp and 174Ibft torque with a standard brand new bosal from the local factors. All these "go-fast" systems seem a bit of a waste of money to me and I have proven that.

 

Maxi

 

It certainly didn't feel like I lost any power when I went from a standard downpipe/ magnex mid and rear to a bosal system, but my problem is it seems to leak from every join

[maxi 36 1 Cars]

It certainly didn't feel like I lost any power when I went from a standard downpipe/ magnex mid and rear to a bosal system, but my problem is it seems to leak from every join

 

 

I always weld them together and make some support bracketts to brace where the pipe goes into the central silencer. There downfall is they do snap at this point through engine movement.

 

Maxi

[Baz 421]

they certainly do, the later skidded/braced systems are better, but they still seem to crack very easily. Std systems should be fine IMO.

[John_B 11]

I always weld them together and make some support bracketts to brace where the pipe goes into the central silencer. There downfall is they do snap at this point through engine movement.

 

Maxi

 

Glad to see it's not just mine then. How long do they last before snapping then Maxi? Got any pics?

[Baz 421]

The Magnex system i had previously lasted around 20k, certainly no more before cracking around the manifold flange, and where the pipe enters the front of the centre box, this was on just a 1.9 8v, and the later system with skidded boxes too...

[sutol 0]

Read lots of opinions on Mi exhausts and learned very little. Need to make a decision on what to do with mine soon.

Bash the tunnel in some say but never by how much. Bash it in a lot but how much is a lot. I am leaning towards cutting and welding but will I lose any floor space for clutch depression etc.

I intend to weld in a flexi bit to the down bit which will hopefully stop it breaking the pipes.

Am I on the right track here or what

[Baz 421]

Don't bash anything...

 

If you mean manifold, either have a std 8 branch one cut and re-wlded, use an angling plate or go the whole hog and buy a Miles/Maniflow/Pugspares type 4-2-1.

 

As for the system, as said a few times in this topic already, nothing wrong with std.

[sutol 0]

Don't bash anything...

 

If you mean manifold, either have a std 8 branch one cut and re-wlded, use an angling plate or go the whole hog and buy a Miles/Maniflow/Pugspares type 4-2-1.

 

As for the system, as said a few times in this topic already, nothing wrong with std.

All well and good but that is going to cost and , like my missus, I have a very tight purse

 

Altering the floor will cost me zilch as will the exhaust so I need to nkow how much to bash/weld to save me lots of time measuring and trial fitting etc

[jim205GTI 3]

No don't bash, i think it was d-9 on here who had a rather nasty experience of bulk head bashing

 

 

i've used an angling plate from QEP....... saved alot of trouble....and i don't think it was that expensive...

[daveyboyblack 1]

Thanks for the replies everyone. I think i'll be going down the standard route as it seems a good choice, especially for the cost.

 

Cheers

Dave

[maxi 36 1 Cars]

Thanks for the replies everyone. I think i'll be going down the standard route as it seems a good choice, especially for the cost.

 

Cheers

Dave

 

 

A word of warning, the only std system that has ever worked for me has been the Bosal without the downpipe split. I have never tested/used any others, especially those with the silly split in them.

 

Maxi

[Alastairh 47]

No don't bash, i think it was d-9 on here who had a rather nasty experience of bulk head bashing

i've used an angling plate from QEP....... saved alot of trouble....and i don't think it was that expensive...

 

Second. I've removed a mi before that was converted by a well know peugeot specialist. 3 years down the line, the car was a rottern death trap.

 

For the price of QEP manifold, i think it calls to be less tight, and if you ever go to sell the car, you'll struggel to sell it if the buyeer knows anything about 16v 205s.

 

Yeah i agree with Maxi about the down pipe issue. They always just seem to crumble and become really restrictive hence any of the 205s i've built i opt for the simple units.

 

Al

[Hardcharging 0]

I was told that the split in the down pipe will give more power and torque.

As it acts as a continuation of the manifold keeping the gasses at the correct velocity. (spelling!)

Otherwise the gasses slow down as they exit the manifold.

So it seems standard set up is good for up to 200 hp

 

Removing it on standard car made about 10 hp less on Mikeanics rollers.

 

156 hp was the best he could do without the spliter!

 

He could tell it had been removed!! and said putting it back in would result in more power.

 

we were advised to put it back in and fetch the car back in the new year.

 

So we shall have to wait for the results in the new year.

 

My coligue has an Mi that pulled 176 bhp on "mike's" rollers, running a 57i induction and standard down pipe.

[Alastairh 47]

My last engine made in excess of 216bhp and 174Ibft torque with a standard brand new bosal from the local factors. All these "go-fast" systems seem a bit of a waste of money to me and I have proven that.

 

Maxi

 

 

So it seems standard set up is good for up to 200 hp

 

Thats not the case...