A manufacturing process for obtaining extruded products, wherein the said manufacturing process comprises the following step a. Casting a billet from a 6xxx aluminium alloy comprising: Si 0.3-1.0 wt. %; Fe 0.1-0.3 wt. %; Mg 0.3-1.0 wt. %; Cu <1.5 wt. %; Mn <1.0%; Zr < 0.2 wt. %; Cr < 0.4 wt. %; Zn < 0.1 wt. %; Ti < 0.2 wt. %; V < 0.2 wt. %, the rest being aluminium and inevitable impurities; wherein the content of eutectic forming elements Mg, Si and Cu is selected to present in equilibrium conditions a solidus to solvus difference higher than 5°C; b. Homogenizing the cast billet at a temperature 30°C to 100°C lower than solidus temperature; c. Heating the homogenized billet at a temperature lower than solidus Ts, between Ts and (Ts - 45°C) and superior to solvus temperature for a time long enough to ensure a complete dissolution of precipitated eutectic phases; d. Quenching the heated billet until the billet reaches a temperature between 400°C and 480°C while ensuring billet surface never goes below 350°C; e. As soon as the billet temperature reaches a temperature between 450°C to 480°C, extruding the said quenched billet through a die to form at least an extruded product; f. Quenching the extruded product down to room temperature; g. Ageing the extruded product, without beforehand applying on the extruded product any separate post-extrusion solution heat treatment, said ageing is made in two successive steps. First a natural aging step of minimum 1 hour, preferably more than 48 hours, is applied in order to maximize material strength at peak age condition. Then a one- or multiple-step artificial aging treatment is applied at temperature(s) ranging from 150 to 200°C for a prescribed period of time, between 1 to 100 hours. a. Casting a billet from a 6xxx aluminium alloy comprising: Si 0.3-1.0 wt. %; Fe 0.1-0.3 wt. %; Mg 0.3-1.0 wt. %; Cu <1.5 wt. %; Mn <1.0%; Zr < 0.2 wt. %; Cr < 0.4 wt. %; Zn < 0.1 wt. %; Ti < 0.2 wt. %; V < 0.2 wt. %, the rest being aluminium and inevitable impurities; wherein the content of eutectic forming elements Mg, Si and Cu is selected to present in equilibrium conditions a solidus to solvus difference higher than 5°C; b. Homogenizing the cast billet at a temperature 30°C to 100°C lower than solidus temperature; c. Heating the homogenized billet at a temperature lower than solidus Ts, between Ts and (Ts - 45°C) and superior to solvus temperature for a time long enough to ensure a complete dissolution of precipitated eutectic phases; d. Quenching the heated billet until the billet reaches a temperature between 400°C and 480°C while ensuring billet surface never goes below 350°C; e. As soon as the billet temperature reaches a temperature between 450°C to 480°C, extruding the said quenched billet through a die to form at least an extruded product; f. Quenching the extruded product down to room temperature; g. Ageing the extruded product, without beforehand applying on the extruded product any separate post-extrusion solution heat treatment, said ageing is made in two successive steps. First a natural aging step of minimum 1 hour, preferably more than 48 hours, is applied in order to maximize material strength at peak age condition. Then a one- or multiple-step artificial aging treatment is applied at temperature(s) ranging from 150 to 200°C for a prescribed period of time, between 1 to 100 hours.