New exhaust....to go 2.5 or 3 in?? Thoughts?

jjsaul Aug 8, 2018

  1. jjsaul

    jjsaul Active Member Supporter I am in uk

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    My DP is knackered as is the back end so have decided to replace the whole lot....been to a local fabricator who I've heard lots of good things about and happy to use them BUT my only decision now is whether to go 2.5in or 3in pipe?

    My truck is a 12v 4.2 TD with an intercooler fitted if that makes any difference...
     
  2. clivehorridge

    clivehorridge Well-Known Member Guru I am in romania

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    Everyone seems to like to fit 3” to the 4.2 TD, but when I had a SS zorst made for my naturally asthmatic 1HZ, the guy did flow tests and punched a load of numbers into his puter and came up with 62mm (in new money) as the optimum (2.5”).

    Can’t help you any more than this, which isn’t helpful at all really.... :icon-rolleyes:
     
  3. Animal Mother

    Animal Mother Well-Known Member Supporter I am in wales

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    I'd say 3". It has the best cooling benefits.
     
  4. Dervis Garip

    Dervis Garip Well-Known Member Supporter I am in cyprus

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    Went for a 3 in with two mufflers to reduce noise and give a nice crisp note. Also had a 3.5 in flange made for the back of the turbo for better flow. The exhaust will make a difference but you need to upgrade the turbo to get the best out of the intercooler, a job on the list of mine still.
     
    Animal Mother likes this.
  5. Animal Mother

    Animal Mother Well-Known Member Supporter I am in wales

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    We require a video clip of the noise please.
     
    fbnss likes this.
  6. Dave_S

    Dave_S Well-Known Member

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    Need to get the exhaust sorted on our 80 series too - been debating just buying a stock pattern system from Milners or getting one made up locally. What sort of $$$ is your local place quoting James?
     
  7. Josh Tagg

    Josh Tagg Well-Known Member I am in uk

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    Mines 2.5, with a resonator and a silencer in my project mush you can see pictures. Sounds awesome round town and can barely here it on motorway
     
  8. Dervis Garip

    Dervis Garip Well-Known Member Supporter I am in cyprus

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    This is a recent clip on idle. Sounds better whilst driving it up the road.

     
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  9. chapel gate

    chapel gate Well-Known Member Supporter I am in england

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    Mines 3" from the turbo, had a new dump pipe fabricated too. Personally I'd have the resonator and silencer fitted. They wont effect performance and, as my mate recently commented the next day after i passed him on the way home from work, it will still sound like "THUNDER"!
     
  10. Shayne

    Shayne Well-Known Member Guru

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  11. Grimbo

    Grimbo Member I am in great_britain

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    Anyone had a price from these guys or even have one of these exhaust's ?
    That's neat , well made and use's original mounting points and rubbers ......something I've not seen on many UK made systems , also many of the one's I've seen have the flexi bit further down the pipe .
     
  12. Shayne

    Shayne Well-Known Member Guru

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    Stainless is brittle and has a tendency to crack at welds so using flexi to separate the bulk of the exhaust from the solid down pipe is a good idea .

    I intend at some point to get mine made by Prospeed in Cardiff as i've been very happy with the 3" exhaust they made for my 90 (others since have not been so happy) but if you come across a ready made 3" while searching please share it .

    My 80 is 24 valve though .
     
  13. fbnss

    fbnss Well-Known Member Supporter I am in england

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    I hope.you manage to.find them this time :)
     
  14. Animal Mother

    Animal Mother Well-Known Member Supporter I am in wales

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    Lovely. :):cool:
     
  15. nielsc

    nielsc Member I am in belgium

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    You will only benefit from 3” if you also get the elbow on the turbo in 3”, this is what gives the most increasd in low down torque.
     
  16. Rob-o

    Rob-o Active Member

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    I recently fitted a 3” pipe including the dump pipe and it’s a different vehicle on the motorway. Just wants to keep going. Straight through and full length and it’s quiet with the windows shut and fun with them open!
     
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  17. Dave_S

    Dave_S Well-Known Member

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    Any indication on price Rob & co?
     
  18. StarCruiser

    StarCruiser Well-Known Member Supporter Guru I am in uk

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    And where from? :)
     
  19. Shayne

    Shayne Well-Known Member Guru

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    I think i paid about £600 each for the ones on both my 90's from Prospeed and i would expect it to be around the same for my 80 .
    The volume of the exhaust is your choice so i can only advise the deep and smooth rumble i ended up with is recognized and enjoyed by eveyone i've spoken to locally making me wish at times i'd specifically asked for a loud exhaust instead of just saying make it sound like it looks .
     
    Dave_S likes this.
  20. jjsaul

    jjsaul Active Member Supporter I am in uk

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    Sounds like 3in is the way to go. Price is £600+VAT so £720, that is fully fitted and includes a flange off the turbo custom made as well. That's from Keltec in Leeds, I've heard lots of good things from guys with other cars who have been there. It's booked in at the end of this month so I'm happy to give some feedback in September!
     
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