ACT Big Bore Exhaust System - quieter option for de-cats

[tail slide]

ACT and JP have developed a trackday-friendly option on my T350, probably suitable for Tamoras and Sagaris as well.

In March I had ACT's new big-bore system fitted, which sounded gloriously throaty on part-throttle, but on wide open throttle barked a bit above 4500rpm. The proof came last month it reached 105db @ 5k revs on the standard static db test, which was going to cause problems at many trackdays. The culprits were my high-flowing Quick de-cats - the standard design would be fine with cats.

ACT and JP were very helpful, and in short order a day at JP was arranged where they dismantled then re-welded the entire stainless system, selecting much longer centre cherry-bombs, and larger 3" diameter tail pipes with short perforated inserts as a final tweak to take off some 'rasp', they told me. Personally I reckon these suit the rear apron of the car much better than the small originals too.


Oulton Park trackday yesterday in similar dry but cool atmospheric conditions revealed an impressive reduction, on the exponential decibel scale, right down to 101db.

















Link to ACT S6 exhausts; http://www.actproducts.co.uk/shop/sj15a-tvr-t350-f...

[BCA]

It was a BIT LOUD before!

I see the rear diffuser trials are starting too... out of interest, what events are you doing beyond Prescott? It looks like I am working that weekend now. Mallory?

[tail slide]

Not at an event until Pembrey and Mallory... maybe a few more later, but this year is pretty relaxed, just enjoying it on the road and a few trackdays

[BCA]

Ah, I am hoping to be at Mallory.

May catch you on track later in the year too - I feel it is time for the T350c and I to get to know eachother better.

We made 94db at Loton and have an equally quiet (hopefully) back box waiting to go on shortly too.

[Targarama]

Looks lovely. Paul, does the revised exhaust pop and bang? That is what I want to avoid. Also, is this tweaked version available to buy from Act now?

[darkmark07]

Just had the same exhaust fitted and now paired to a set of Dave Chant's de-cats.

If you don't want pops and bangs, you DON'T want this setup. Previously with stock back box and decats, I'd get a small pop on the overrun c. 3k revs and a very occasional one on up-shift, now you get it from c. 4k down and frequently on the up-shift at high revs as well. Some of them are also quite loud.

Personally, I love it.