Been hearing a lot of good things about how these Harvey trick up pipes. Anyone got any info on them and what kind of power gains I'd get out of one of these fitted to my wrx hatchback ?

 

They are fantastic, to say they are tried and tested is an understatement. I ran my car on a larger artermarket up pipe originally, we swapped out for a Harvey Trick up pipe, after the map tweek, we were up on low down power and spool!
Unbelievable gains from a bolt on mod.
The quality is superb, hand made and in a different league to the chinease "eBay" specials

One of the great things about this product is they are avalible in different bolt patterns and sizes, so suit all applications. Standard and aftermarket headers. Used on standard cars right up to cars 500bhp and more.


As I said, a tried and tested upgrade, very good value

Speak to Alyn at AS Performance 0191 410 3770

 

I had the 2 bolt on mine and with ported headers you can tell the difference. I've just upgraded to gt spec and got the 3 bolt to match due to it being good before

 

Are these as effective on a classic?

 

Oh okay that's good to know ..is there a particular one to whatever car you own ie is a hatchback version of it different to a classic or do they generally just bolt on to all kinds of Impreza's ?

 

It will be matched to what turbo you have well worth it

 

Ok mate cheers! Are they around the £150 mark ?

 

About that yes search for asperformance on here

 

Ok mate cheers! Thanks for that

 

If memory serves, I recall 139 sovs (not sure if that's with VAT)... Certainly for the 2-bolt, single-scroll jobbie, at any rate.

 

What's the difference between a 2 bolt and 3 bolt mate ? Sorry for all the questions

 

Some aftermarket headers employ a non-OEM, but more robust, 3-bolt pattern for the up-pipe's mating flange. Like RCM's and the 3-bolt version of the GT Spec2 ones.

So, unless you have a set of
3-bolt headers already on your car, then you'll need the regular 2-bolt trick up-pipe.

 

3 bolt is for the gt spec headers and 2 bolt is the standard header size. I bought a 3 bolt last week for £165 and previous 2 bolt was about the same. Delivered

 

I'm assuming I have a 2 bolt bolt header then! Don't quote me that but I don't know of anything else other than that being added when I bought the car 2 months ago

 

Odds are, yes. In that you've no doubt got the original OEM exhaust set-up still on.

You can easily check, though... Just stick your head under the car, either forward or aft of the driver-side front wheel. You'll see the headers joint with the up-pipe...

 

Or a good upgrade on the other thread who is selling the gt spec headers and trick up pipe at a good price. Typical I've just bought the same new last week

 

I currently have a mongoose full system up to the turbo mate

 

Yeah I saw that actually earlier on, but wasn't sure on the fitting and whether it would fit mine to be honest

 

OEM 2 bolt pattern:



3 bolt:


Go check...

 

Ok mate I will do....you guys have been a great help

 

I wish I'd known about these before I put my engine back in, doh!

Should you wrap the harvey pipe or leave it as it is? Ive read mixed things about wrapping as it can get covered in water, oil and road dirt etc?

Can the uppipe be installed without having to take the engine out?

 

Yeah still can be done with the engine in. They come wrapped already. You won't get road dirt if you still have the engine guard still fitted

 

sorry dont get on here often, simply contact the offcie direct by email or call 0191-4103770 and they will sort a suited pipe to your requirements

 

Ok, I managed to get the over sized Japspeed up pipe off after fitting it and putting the engine back in during a recent clutch change job. I wish I would of known the larger diameter Japspeed up pipes are not ideal before the engine went back in but hey ho, it wasnt actually too hard getting the up pipe out with the engine in situ.

One thing I do find odd though, after reading some guides and looking underneath the car, why do people opt to jack up the engine to give a little more room and squeeze the up pipe out from underneath!?! Its way, way easier just to unbolt the RH side exhaust manifold from the engine and the up pipe literally falls out! I attempted the 'jack up engine' method first and the engine did not seem very happy being forced upwards with the transmission still attached (yes I removed the engine mount nuts and the pitch stop thank you) and thought **** this, Im not putting my fingers in the small area where the up pipe lives when the jack is holding the engine up. Besides, even with the engine jacked up I could not see how the up pipe would come out past the exhaust manifold anyway so I abandoned that idea.

Ten minutes later, I had the up pipe out after removing the manifold which had 2 bolts holding it to the front centre exhaust manifold and 3 head stud nuts. Voila, easy peezie.

Yeah okay, Ive broken the gasket 'seal' but after cleaning up the faces, giving the studs and bolts a rub down and using new gaskets, this seems like a far more logical method to me.

Right on to my question lol...

I know these Harvey trick up pipes are considered to be very good but Im just curious to how they compare to the stock STI decated up pipe? The reason I removed the stock up pipe was because the heat shield had broken off and had been rattling. I had a Japspeed up pipe laying around so I - wrongly - installed that. Since finding out the Japspeed pipe is a bad idea, its been removed.

I removed the stock up pipe heat shield to get to the pipe underneath and compared it to photos of the Harvey trick up pipe and they do seem very similar, are they intended more for people with catted up pipes (WRX's) looking to go decat or are they also better than the stock STI decat pipes? I can see the stock pipe has a flexible bellow and does taper sharply to a smaller diameter at the very end of the pipe before the flange that mates with the turbo. The Harvey pipe has a double skinned slip joint and has a less aggressive taper towards the turbo flange. Overall pipe diameter seems the same.

At the mo, Im toying with the choice to go Harvey trick or stock STI pipe.

Either way, I unfortunately will not be heat wrapping the up pipe after reading horror stories of wrap being a fire hazard when hot spots form where there are gaps or weaknesses in the fabric, not to mention the wrap accelerates the degradation of the metal underneath as it cannot breathe and any oil, fluid, water, crud etc turns the heatwrap into a candle wick. Personally Id rather live with slightly higher temps in the engine bay.

 

Some qood question in the latest post. Doesn't anyone have answers to them?

 

Maybe if the question wasn't from 2016

 

What question HS vs STI up-pipe ?

I went from stock to Gt-Spec Headers & HS Up-pipe so not best back to back comparison.

 

there are differing specs of HS trick up-pipes to suit various applications............

rarely get time to answer individual forum queries as we are mega busy day to day so as previous post simply contact our office direct by email or call 0191-4103770