Hilux 2 1/2" exhaust upgrade

Submitted: Wednesday, Jan 24, 2007 at 08:16

ThreadID: 41566 Views:8666 Replies:4 FollowUps:3

This Thread has been Archived

Twinkles

Help please! Anyone had this done to their 3ltr turbo? I put in other threads and rang the businesses recommended but can't get a satisfactory answer as to whether I should replace the dump pipe on the Hilux when upgrading the exhaust.
One says it's probably too tight to do, another says I'll loose low down power because of reduction in back pressure, another that the existing dump is almost the same size as the 2 1/2" exhaust.
Beaudesert Exhausts do replace the dump pipe but I'm not in a position to fit it myself. They are in QLD and I'm in Vic. If I purchase their kit it would become very expensive by the time I pay someone to fit it as well as shipment.
Has anyone put a 2 1/2" exhaust on their Hilux? Did you replace the dump pipe? Did you get a noticeable improvement in performance? Where did you get it done? How much did it cost?
Would replacing the exhaust with 2 1/2' inch, mandrel bent with flow through exhaust and flexible joint be improved much by replacing the dump pipe as well?
What is usual practice for the Hilux?
Thanks in advance.

Back Expand Un-Read 0 Moderator Share

Reply By: Twinkles - Wednesday, Jan 24, 2007 at 08:25

Wednesday, Jan 24, 2007 at 08:25

I also have another problem with fitting a pre made exhaust. I may be having the motor gassed which will require an alteration to the direction of exhaust around gas bottle, so want exhaust made to suit.

AnswerID: 217421

Reply By: Member - Bucky (VIC) - Thursday, Jan 25, 2007 at 09:30

Thursday, Jan 25, 2007 at 09:30

Did my Navars 6 months back ,,,, cheep as, but needs a little back pressure ( on 4 cylinders )
Not too dear either $ 220 finished

2 1/2 " exhaust , left the first bit of the tailpipe on, from the centre of the door back was replaced thru a straight thru hotdog muffler,,,,, Bloody beautiful,,,

Immediate 10 % power lift, and a full range of power, even at low revs,, virtually no " lag "

No real economy boost though

Love it

Cheers
Bucky

AnswerID: 217676

Follow Up By: Twinkles - Sunday, Jan 28, 2007 at 21:21

Sunday, Jan 28, 2007 at 21:21

Who did it for you Bucky?

FollowupID: 478669

Reply By: Member - Bucky (VIC) - Monday, Jan 29, 2007 at 14:27

Monday, Jan 29, 2007 at 14:27

Scott,, at T - for - Tyres Wonthaggi, ( exhaust, hydraulics, and of course Tyres ) or pretty well any exhaust centre, that do not have " hungy " operators, and believe there are still a lot of real nice people out there to help

Cheers
Bucky

AnswerID: 218380

Reply By: Member - Glenn D (NSW) - Monday, Jan 29, 2007 at 20:57

Monday, Jan 29, 2007 at 20:57

Hows it going Twinkles ,

I am prepared to be corrected , but am lead to believe the less backpressure the better with turbo motors , lets the turbo spool up quicker . Have a look at some jap imports for some 4" pipes.

Having said that you are probably better off removing the whole restriction after the turbo than half of it.My 01 WRX had a really restrictive dump pipe from the turbo, the first part anyone changed , 4.2td Patrol apparently has the same thing.

Been thinking a bit more , maybe backpressure is a complete hoax , was watching the drags on TV on the weekend , the cars had short straight through pipes , and what about extractors , tuned length to give low pressure at the port that is exausting to suck the exaust out.

Please educate me.

Glenn.

AnswerID: 218479

Follow Up By: Twinkles - Monday, Jan 29, 2007 at 22:04

Monday, Jan 29, 2007 at 22:04

Hi Glenn,
I rang Beaudesert Exhausts and they recommend a total replacement, dump pipe as well, with a 2 3/4" mandrel bent pipe. No one else was prepared to give definitive answers.

FollowupID: 478917