What BHP gain will i get from these ????

[Dan GTI]

If anybody wants to believe that adding an exhaust and cone filter adds 10-15bhp then thats up to them - but I wont believe until I've seen a rolling road print out to prove it!

The manifold is the "compromise" in most manufacturers vehicles. Remember that 90% of cars that come off of the production line are all about compromise. Your average joe bloggs does not want a car that does under 20mpg, breakes their back because suspension is so hard, has an exhaust that is so loud they can't hear the person next to them etc etc. Exhaust on the GTI is definately better than some, but still a compromise. A 2.5 system is the best way to sort out the back pressure and increase mid-range torque - but not necessarily a guarentee to a bhp increase. Add on a 4 branch as well to optimise the benefits. 4 branch, plus full s/s system is probably good for 4-5bhp but will set you back £650 plus for anything decent. The cat is also another compromise. No point having a 4 branch into a cat tbh - defeats the point of what your doing.... Change to a sports cat and you've spent another £250 - thats almost £1k on the exhaust and not many mk3's (which are generally over-priced as they have a GTI badge on them) are worth that!! I've just ordered a Milltek S/S exhaust because the exhaust on my car is completely rotten and if I've got to pay £200+ to replace it I might aswell pay a little bit more and get an exhaust that will last the life of the car.

If you want true bhp increase you need to look at things like lightening pullys and flywheels. Porting and polishing, changing the cams (will make the car a little lumpy at low revs) boring out the engine to a 2.1 (diesel crank) or whacking on a supercharger or turbo.

[Wayne]

When I worked for a well known VW tuning specialist we did a r/r test on exhaust systems with a magazine, the car we used was a mk2 8V and in total we tested 8 systems, Jetex, magnex and Remus added around 4 bhp all the rest were the same and one even lost power.

[hammerdrew]

Ok.. im gonna stick my neck on the line here......... 

If you shell out well earned sheets for say a Full system exhaust, inducton kit, ECU chip stage 1 (as these are the standard mods anyway) then i reckon you will be looking at around £800 for ROUGHLY 10bhp! Given the price you paid for your MK3 too, say £800-£900 roughly for a half decent one with 100k on the clock and you've got £1600-£1700.... May as well just go buy the VR and be done with it  As already said, unless you wanna spend spend spend, then forget it! They are highly tuned anyway.. and if taken care of can be lots of fun anyway  HAHAHA

Just my opinion....... Anyone else agree?


  i would agree, although running cost and insurance are a possible argument against your plan 

Ahh my cunning plan is floored!!! Doh! But yeah your right running costs will be different!

[Mikester]

When I worked for a well known VW tuning specialist we did a r/r test on exhaust systems with a magazine, the car we used was a mk2 8V and in total we tested 8 systems, Jetex, magnex and Remus added around 4 bhp all the rest were the same and one even lost power.

But when he worked for the mk3section of golfgtiforum, the only way to gain power was a drilled airbox, and an abf.

[Wayne]

When I worked for a well known VW tuning specialist we did a r/r test on exhaust systems with a magazine, the car we used was a mk2 8V and in total we tested 8 systems, Jetex, magnex and Remus added around 4 bhp all the rest were the same and one even lost power.

But when he worked for the mk3section of golfgtiforum, the only way to gain power was a drilled airbox, and an abf.

 

[Len]

When I worked for a well known VW tuning specialist we did a r/r test on exhaust systems with a magazine, the car we used was a mk2 8V and in total we tested 8 systems, Jetex, magnex and Remus added around 4 bhp all the rest were the same and one even lost power.

But when he worked for the mk3section of golfgtiforum, the only way to gain power was a drilled airbox, and an abf.

With no garage or Golf! 

[Wayne]

When I worked for a well known VW tuning specialist we did a r/r test on exhaust systems with a magazine, the car we used was a mk2 8V and in total we tested 8 systems, Jetex, magnex and Remus added around 4 bhp all the rest were the same and one even lost power.

But when he worked for the mk3section of golfgtiforum, the only way to gain power was a drilled airbox, and an abf.

With no garage or Golf! 

  

[Len]

I have no idea whats in a Mk5 GT but I believe it to be  a non-turbo 2.0 litre 16v.
So must be abf based and that is quoted at 170bhp so what differences are there?

[Wayne]

I have no idea whats in a Mk5 GT but I believe it to be  a non-turbo 2.0 litre 16v.
So must be abf based and that is quoted at 170bhp so what differences are there?

Might be wrong and will stand corrected if so but is it not a different series of engine I believe.

Edit just checked, 2.0 is a diesel

[Len]

Yes it probably is but look at it on a very basic level its a 2.0 litre 16v and unless the head and valves are different, i.e. more flow/bigger valves. There shouldnt be any difference in power!
I can now prove that remaps dont produce great amounts of power, so what is it?