| What you need to know about 5 bolt down-pipes and turbos for the Z32. Specialty Z vs Alloy toyZ mated to gt2854s, gtx286xx, gtx29xxs & gtx30xx turbos. I have known about this issue had a good opportunity to this week to compare side by side these turbochargers and down-pipes Spoiler, your better off with SZ's and SZ are a must for pretty much,29, and gt30s (i didnt have a disco or gt286x on hand, please chime in with a photo and measurement if you do). If your going with a GTX29 or GTX30 we know that the alloy toy down-pipes are too small and will choke your turbos exhaust. Several times my customers have dropped of builds with Alloy toys down pipes that we had to order in the correct SZ pipes to suit there turbos. Maybe this will save you some hassle. The AlloyToyz have a 46mm turbine tube inlet
The Specialty-Z have a 55mm turbine inlet, 8mms larger
The GTX2860 gen 2 is 49mm ( measured by Tarik Laaraj)
The GTX2967 turbo outlet diameter is 52mm
The GTX3071 turbine outlet diameter is 56mm More captions and notes are attached to each photo. Your fine with any pipe on the jwt 550s and down but I never liked knock of parts anyways.... ZyaL8R!
Dane Miller
Houston ZAuto
From left to right, GTX gen 2 3071, GTX gen1 2967, JWT sport 550(gt2854), Stock turbo(pictured for fun)
From left to right, GTX gen 2 3071, GTX gen1 2967, JWT sport 550(gt2854)
GTX gen 2 3071 have a 56mm turbine outlet diameter
 gtx 2967 have a 52mm turbine outlet diameter
 The GTX2860 gen 2 is 49mm ( measured by Tarik Laaraj)
 gt2854(jwt 550) have a 46mm turbine outlet diameter
 Stock turbos have a 38mm turbine outlet diameter
 SZ on the left, alloytoyz on the right. Notice the taper at the beginning of the alloy toys turbine inlet tube
 Notice the taper at the beginning of the alloy toys turbine inlet tub
 alloy toys turbine inlet tube diameter 46.2
 SZ inlet diameter 54.2mm
 Alloy toyz have a flange divider that was origanally introduced to reduce turbulence. But after tuning gt28 cars on breather mods it became apparent that this divider caused boost creep because it blocked to out wastegate gases from easily leaving the turbine housing. SZ simply no long produced theres with the divider. Note i have not seen the boost creep issue in any other set ups such as:
2.5 down pipes with full breathers
3inch down pipes with dividers on smaller turbos such as 550s, 530s or anything in the gt25 family
 close up of alloy toyz flange to pipe finish
 Close up of the SZ flange to pipe finish
 alloy toys actual I.D.
 SZs actual outlet I.D. (its larger)
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What you need to know about 5 bolt down-pipes - 
