TD42 New exhaust????????

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Originally Posted by Bigrig

Wait till you here the tone come out of that thing, I fell in love with mine all over again when I got the exhaust done!

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Yeh cant wait! She's abit noisy with the flex joint collapsed/broken at the moment. Did you do similar in 2 1/2 inch, With sports muffler? Dunno the difference between sports and normal muffler?

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Originally Posted by 89GQ

Yeh cant wait! She's abit noisy with the flex joint collapsed/broken at the moment. Did you do similar in 2 1/2 inch, With sports muffler? Dunno the difference between sports and normal muffler?

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I ended up putting on pacemaker extractors and a 2.75" mandrel bent pipe (no cat converter) so now it makes a very nice tune through the rev range!!!

GQ sorry about bum steer on headers/manifold, most times extractors are better than factory manifold

Tim

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Originally Posted by Finly Owner

GQ sorry about bum steer on headers/manifold, most times extractors are better than factory manifold

Tim

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No bum steer at all Tim! It was one of the blokes at the 4by shop that said it! Im'e still not really convincerd the original manifold would have as much free flow as headers!! Will be looking into it more, He quoted that the manifold on the TD42's had a large internal diameter and wouldnt really notice a huge difference, Mind you he also said bench bends are better than mandrel???? So will still see a few more places and get some more feedback. Cheers Jeff

The factory exhaust manifold may have a large internal diameter but extractors use tuned length pipes to draw the exhaust gases out of the cylinders.
Bench bends better than mandrel........in what universe???

Tony

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Originally Posted by YNOT

The factory exhaust manifold may have a large internal diameter but extractors use tuned length pipes to draw the exhaust gases out of the cylinders.
Bench bends better than mandrel........in what universe???

Tony

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Yeh he rekond bench bent for better back preasure as well, What the!!!!!!

I can get a complete system with headers for $770, but its 3 inch! Does it make that much diff with 3 inch? Just that iv'e been told 2 1/2 is better.

A bit of back pressure is good (apparently) on a naturally aspirated motor but there should be enough in the mufflers.
3" on a naturally aspirated 4.2 is over kill, 2.5" is heaps, but as Scotty has proven with his 2 3/4 mandrel bent system it will still work well.
In rough terms a 3" press bent pipe would flow roughly the same as a 2.5" mandrel bent pipe.
Also, just be aware that any petrol powered vehicle built after about 1984 legally must have a catlytic converter, you risk large fines if you don't have one.

Tony