Twin Outlet Stainless Silencer

[maxstu]

My recently purchased 1987 Autosleeper DG1.9
LPG with autobox is running early manifolds and a stainless silencer twin tailpipes.
In your opinion will this set up gain or restrict bhp?
To my feel it is restricting.

[Robsey]

I read somewhere that if I ran my 2.1 dj on an early exhaust system, then it would lose approx 10 bhp.

102bhp compared to 112bhp with the later exhaust system.

In English money, approx 9% reduction overall.
So that sounds like a restriction to me.

I suppose it depends on how much gain in bhp your twin exhaust has over the "standard" early exhaust.

[maxstu]

Three campers' earlier (my first) ran early pipes and original single tailpipe. And that ran absolutely fine.
The engine is sound. The autobox plus LPG robs a bit of power, and yet compared to my other camper, a DJ2.1 on E10 it feels very stifled.
I guess a compression test is the way to go.

[Robsey]

If you weren't used to the 2.1 previously, then maybe that is why the 1.9 feels stifled.
It is a much lower bhp compared to the 2.1.

It will be like the 2.1 running on 3 cylinders but without the lumpiness of a mis-fire.